Why is my completion percentage 101.8 and nobody else on Game Center has over 100?
Because Game Center sucks and should be ignored, completion rate at least.
Lol 101.8? Wow i thought it couldnt go higher than 100 because of game center
Lol at least yours is somewhat accurate; mine is 0% on GC yet 107% in-game lol
I’m the same, I’ve completed 114.91% of the arks yet gc doesn’t show 100% 
Like I said, Game Center sucks
I’ll be glad when they finally get rid of it