I counted my time as about 1:47 but the mods had it as 1:41, is the grading cutscene not counted or something? Its quite a large discrepancy i dont know where that would come from

the in-game timer is used, not real time, which does exclude the grading scenes and some other stuff, yeah.

We use the In-game time for runs (the one that shows up on the final judgement screen), because we want to think you won't be using Livesplit with RTA but just simply submit the time the game tells you.