Warnings like: "Duplicate path detected"

With some uploads (but not all) I am getting warnings like:

DeletedFiles: 8
DeletedFolders: 8
ModifiedFiles: 2
ExaminedFiles: 14976
OpenedFiles: 78
AddedFiles: 76
SizeOfModifiedFiles: 14621498
SizeOfAddedFiles: 330248005
SizeOfExaminedFiles: 53432815508
SizeOfOpenedFiles: 344869503
NotProcessedFiles: 0
AddedFolders: 54
TooLargeFiles: 0
FilesWithError: 0
ModifiedFolders: 0
ModifiedSymlinks: 0
AddedSymlinks: 0
DeletedSymlinks: 0
PartialBackup: False
Dryrun: False
MainOperation: Backup
CompactResults: null
DeleteResults: null
RepairResults: null
TestResults:
    MainOperation: Test
    Verifications: [
        Key: duplicati-20190915T070250Z.dlist.zip.aes
        Value: [],
        Key: duplicati-id206d38cb9524ce3aeb54dfe7847b005.dindex.zip.aes
        Value: [],
        Key: duplicati-bc6bc610c38d44b089d63c3cc295ddcfc.dblock.zip.aes
        Value: []
    ]
    ParsedResult: Warning
    Version: 2.0.4.5 (2.0.4.5_beta_2018-11-28)
    EndTime: 9/15/2019 2:10:46 AM (1568531446)
    BeginTime: 9/15/2019 2:09:18 AM (1568531358)
    Duration: 00:01:28.3237017
    Messages: [
        2019-09-15 02:02:50 -05 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started,
        2019-09-15 02:04:28 -05 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started:  (),
        2019-09-15 02:04:42 -05 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed:  (2.56 KB),
        2019-09-15 02:05:08 -05 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Started: duplicati-b01f255a6d0c8453da5d211d1cc6b48d3.dblock.zip.aes (49.98 MB),
        2019-09-15 02:05:55 -05 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Completed: duplicati-b01f255a6d0c8453da5d211d1cc6b48d3.dblock.zip.aes (49.98 MB),
...
    ]
    Warnings: [
        2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
        2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
        2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
        2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
        2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
...
    ]
    Errors: []
    BackendStatistics:
        RemoteCalls: 18
        BytesUploaded: 286028537
        BytesDownloaded: 50727335
        FilesUploaded: 13
        FilesDownloaded: 3
        FilesDeleted: 0
        FoldersCreated: 0
        RetryAttempts: 0
        UnknownFileSize: 0
        UnknownFileCount: 0
        KnownFileCount: 2637
        KnownFileSize: 50131118217
        LastBackupDate: 9/15/2019 2:02:50 AM (1568530970)
        BackupListCount: 541
        TotalQuotaSpace: 0
        FreeQuotaSpace: 0
        AssignedQuotaSpace: -1
        ReportedQuotaError: False
        ReportedQuotaWarning: False
        ParsedResult: Warning
        Version: 2.0.4.5 (2.0.4.5_beta_2018-11-28)
        Messages: [
            2019-09-15 02:02:50 -05 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started,
            2019-09-15 02:04:28 -05 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started:  (),
            2019-09-15 02:04:42 -05 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed:  (2.56 KB),
            2019-09-15 02:05:08 -05 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Started: duplicati-b01f255a6d0c8453da5d211d1cc6b48d3.dblock.zip.aes (49.98 MB),
            2019-09-15 02:05:55 -05 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Completed: duplicati-b01f255a6d0c8453da5d211d1cc6b48d3.dblock.zip.aes (49.98 MB),
...
        ]
        Warnings: [
            2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
            2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
            2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
            2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
            2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
...
        ]
        Errors: []
ParsedResult: Warning
Version: 2.0.4.5 (2.0.4.5_beta_2018-11-28)
EndTime: 9/15/2019 2:10:46 AM (1568531446)
BeginTime: 9/15/2019 2:02:50 AM (1568530970)
Duration: 00:07:55.8717568
Messages: [
    2019-09-15 02:02:50 -05 - [Information-Duplicati.Library.Main.Controller-StartingOperation]: The operation Backup has started,
    2019-09-15 02:04:28 -05 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Started:  (),
    2019-09-15 02:04:42 -05 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: List - Completed:  (2.56 KB),
    2019-09-15 02:05:08 -05 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Started: duplicati-b01f255a6d0c8453da5d211d1cc6b48d3.dblock.zip.aes (49.98 MB),
    2019-09-15 02:05:55 -05 - [Information-Duplicati.Library.Main.BasicResults-BackendEvent]: Backend event: Put - Completed: duplicati-b01f255a6d0c8453da5d211d1cc6b48d3.dblock.zip.aes (49.98 MB),
...
]
Warnings: [
    2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
    2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
    2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
    2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
    2019-09-15 02:08:07 -05 - [Warning-Duplicati.Library.Main.Database.LocalDatabase-DuplicatePathFound]: Duplicate path detected: D:\Arch (all versions)\Politics\!,
...
]
Errors: []

This started when one time when during upload I got blues creen (I think blue screen is not related to Duplicati).
What those warning mean and how to deal with them?

I am using: Windows 10 64 bit and Duplicati - 2.0.4.5_beta_2018-11-28.

I do not see those warnings any more. Should I worry about those previous warning or not?