Warnings about file size differences

Hi,
in every backup I get 32 warnings similar to this:
[Warning-Duplicati.Library.Main.Operation.FilelistProcessor-MissingRemoteHash]: remote file duplicati-b8c1ba5f9a2c44af8b6848b526f602340.dblock.zip.aes is listed as Verified with size 42991616 but should be 52382765, please verify the sha256 hash “H1GzddeuL7i5VidtVxnKbEtNw97Ex9umFpzQSvz8crk=”

How can I solve/avoid these warnings?

Many thanks!
Ricard