Shared library - problem: several references only with pdf, but no other information

I have a problem with a shared library. I got invited, and my Endnote started syncing, but many references are empty except for the pdf, but all other information (authors, title, and so on) is missing. Why is this so, and is it possible to change this strange behavior?

I got the whole library as a compressed library - there all the information is existing. Is there a way to tell Endnote that this compressed library is the shared library?

Truly yours!