To make things simple, just use the real FH since FH+ is just problematic all over for new users.
But you should be able to sort the bug/glitch if you check a few things
-You go into Bonfire in the real FeralHeart first with your character, before actually logging onto the same character in FH+, this is because you must be in the same map in order for you to be able to transport between the mods, bonfire island exist in both versions.
-There's a bug in the installation and you need to change the path for it. Instead of having the FH+ game folder inside program files or program files(x86), you should change the installation path to something else like possibly "C:\Feralheartplus".
-And if problems still occur, you could always check your rendering mode, swapping between and see what works best.