I did a quick test, couldn’t reproduce any insane results despite various fiddlings with Calamity.
This is probably what it is- some bug with Momentum. Maybe when you de-sync, the game starts looking at your move speed to determine your Momentum, which then gives you more Momentum, which gives you more move speed, etc. That might explain both the “teleport through the level” and the “hit 18000000t in one click”.