Is this issue project specific, or do you experience the same with other projects?
I would try to re-upload the library to BIMcloud first, if it solves the issue. If still no luck, I can imagine that you might have objects with long name or deep in a folder hierarchy, which might causes this thing to you. Worth a check in solo.
Last, but not least, contact your support (Nolliplan, I believe) and ask for their help.
I hope one of the options will solve your issue.
Customer Engagement Expert, Community Admin