I have started running the console (Xbox) version of this game and was wondering why there are 2 seperate leaderboards for emulator and console?

Presumably speed inconsistencies between hardware and emulation. Afaik, there are no glitches that are used in the run so it can't be an emulator specific glitch. It is very common for speedrun boards to break us up because emulator will consistently hit max speed whilst the console will lag, causing slowdown and thus time loss. (Seek & Destroy is INFAMOUS for this.)