Sounds normal, as many Duplicati processes appear in pairs with the original one (parent) being started from some location (perhaps C:\Program Files\Duplicati 2). That starts the newest version wherever it is.
[SOLVED] Is it ok that I see 5 processes of Duplicati in Windows Task manager? shows a normal full set.
The second part of the logged explanation of event talks about a debugger, which is a similar situation…
Note that if this service is configured to start under a debugger, this behavior is expected.