Library sometimes does not load complete

Hello,
I am casual user of Illustrator. I use a multipage document and I created a Library of objects i repeatedly insert into the document to make it easy. BUT...

Sometimes it happens that I open the document and the library in the Library palette loads incomplete. I see only several objects in it and — have not found a way how to refresh it so it displays them all as always.

I have no filter active and if I click the top right icon „Invite to library“, it opens in new window whole with

all objects in ti. But when I turn back to Illustrator, I still see only some of the objects and it is unusable for my work. I only have to turn Illustrtor off and on and hope all will be OK next time.

Can someone help? Thanks.