Imported bib entries end up with "" string in the title when viewed on the web

After importing a large bib file to a Zotero group, the imported entries look fine in Zotero app (OSX), but have "<title>" string in the title when those are viewed in the Web app:

https://www.zotero.org/groups/6628553/hvei/library

https://s3.amazonaws.com/zotero.org/images/forums/u12195117/902tuw7kr0t22x1i7y64.png

A bug?
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