Multiple apps just disappeared from iPads

Just lost multiple apps across the ipads of a school I look after. Including Reading Eggs and some others. The apps iPad profiles on the app store don't indicate any major changes and the ipads are running a mixture of different iOS versions and updates don't seem to solve the problem. Have tried restarting and also factory reset, reenrol, no luck.

Wondering if anyone had a similar problem recently? Have had a scroll through new and not noticed anyone else yet so thought I'd ask.