Collections don't sync right online

I'm having an issue with the synchronisation of my collections.
I need to use two computers and so I need to have my zotero library in both of them.
When I sync my datas from computer 1 online, I can see my collections, but not all the items in it. For example, I have a collection with 342 items in my computer, but only 139 online, and so 139 on computer 2. However my library shows all of my items... I don't understand, could you help?
Thanks a lot
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