This happens not infrequently. Have you tried reducing the number of entries per page? There are several ways to approach this that are built in to the FR system, and I’m sure someone will be along soon to list them... What is happening in layman’s terms is that too much info is being input where there’s not enough space, for whatever technical reason...
There’s a Freeperthon happening so weird things “happen” to “help” freepers see the need to contribute.