I've noticed that there is a huge disparity between my game ratings and my non-game ratings. My TT rating is 1740 and my Chess Mentor rating is 2074, but my Online-Blitz-Bullet ratings are 1599-1339-1157. Is there a skill that lends itself to better practice and a different skill that helps you play actual games? And if not what other reasons are there for this difference? Thank you for your help in advance.

My Online/Live chess rating is around 1800 and my TT rating is 2500. TT rating can be easily overinflated.