Okay, came across a weird bug and I can only assume this is what's happening
Did Sol's Stage 4 event (cafe visit), then gave Kristy her first brew, then attempt to return to the house, end up at the beach shop...
Roll back, Beach Shop is still the Beach Shop, House is also the Beach Shop...
So, I'm guessing that the Cafe Event use to teleport you back to the Beach Shop, the event manager has it written as a destination, and since the House has a bunch of event flags, when returning it is reading the teleport and loading the Beach Shop
That is the only thing I can think of, as the House appeared to be the only location effected