Whaaa? I’ve never encountered this in any RMXP game I’ve played. It seems like it may be an issue with whatever program you’re using to play on mobile.
Try going into the eastern Sphere district? (On the right side near the bottom, there should be a spot that warps you). I’m curious to see if this has to do with the size of the map.
I’m sorry I don’t have any real answers. :<