Students unable to edit items in group library

I have students in my historical methods class using web-based accounts and a group library I created to share bibliography items. Yesterday we attempted to fix up their entries and add new ones but once everyone got logged in and started to work people ran into trouble editing existing entries--even their own. It started with one person in the class and eventually we were all locked out of editing. Is that because everyone was trying to change things at the same time? Or is there a setting I missed somehow? (They do all have editing permissions as members of the group.)
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