Why do segments I confirm in Groupshare go into the translation memory and do not appear as confirmed to other users of the project?

I am working on a groupshare project with a colleague. If he goes see the segments I have already worked on (that appear of course as confirmed on my laptop), they do not show any modification. However, he can see them in the TM, so he would have to re-confirm every single segment, which is a disaster in a project with over 10k segments. What can we do? I can see his confirmed segments though.

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