Smiff might be right, it could be a bad ROM, the best one for DK64 is the U ! version, the Europe one is not very good.
DK64 has always had problems with the core in the game with any emulator, rememebr the barrell shooting, you need to fiddle with the counter factor in the game to run this part of it.
I hope whenever Schibo releases his final 1964 version, that this is taken care of.