collection will not show all items of a subcollection

Dear,
I don't figure out why and how to solve the following issue.
On my public group I cannot see some publications on the main observatbru collection while they are included in the barometre subcollection. Most publications from this sub-collection are visible.
Example: take all publications called "Barometre YYYY". The 2014 is not visible in the collection "observatbru publications" while 2013 2012 are. And all of them are visible in the subcollection "armoede"

https://www.zotero.org/groups/observatbru.be/items/collectionKey/QZ5DTWR3

How could I solve this ?

Best.
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