Have you tried changing the value of your characters
‘Spawn Collision Handling Method’ from ‘Try To Adjust Location, Don’t spawn if still collide’ to ‘Always Spawn, Igore Collisions’?
Another idea would be to inspect the ‘ActorBeginOverlap’ Event in your characters event graph blueprint.
It as an ‘Other Actor’ output you could log and see who the other Actor is.
Place a Breakpoint and some logging onto this event.