.ion description file timestamp newer in backup than source

Hi there

I keep a backup on F: of a source drive E:
I use replication software viceversa to do this.
When I run my replication process the software reports, correctly is would seem that the .ion files in the destination have a later timestamp than in the source.
When I check from DOpus level e.g. below this seems to be accurate.
Can anyone think why this might be?

Thanks as ever

Because the descrip.ion file was updated when you copied files to the folder it is in, in order to preserve their descriptions.