Ah this is just a common glitch, for some reason, custom maps have been difficult, though, it will be fixed eventually. I am so sorry about this inconvenience, maybe just make your Rp in a public map.
If you want to get your character out of that map, just go up to the right hand corner on this Forum, and click " Character reset" the press "Reset home". This will not delete your character, it will only place it back into lonely cave, so that you can play as your character again.
Again, sorry about this, and hope fully it is fixed son. Best of luck, hope this helped, and if you need anything else, just ask!