I’m in this tournament where the McMahon points seem to be off: https://online-go.com/tournament/58315
There are several examples where players with a very similar strength started with different points (e.g. if you compare John Collins to Go.OK and to me), or where a weaker player started with more points than a stronger player.
Is this a bug or am I just not getting something here? 
*confused*
Of course you are confused! 
Jokes aside, I’ve seen similar problems before, but not nearly as bad as here. I always though they were rounding errors or maybe rating changes very soon after the tournament began. That seems not enough to explain what we see here.
You could ask the tournament director to change some of the point values if they are off for some reason. Other than that, I don’t know what you should do.
Anything to do with “humble ranks” if lots of players are new to ogs?
I am in this tournament too