aHA
i KNEW IT
it is because kingdaro did not sync the movements with DELTA-TIME
and to think HE was the one who TOLD me to do this
I am syncing the values with delta time. My theory was that the lag was causing the acceleration values to be incremented by a lot more than they should, then subsequently incrementing the velocity by that much. I'll just have to check and see.
EDIT: Yeah, I changed a bunch of physics around and even ran a "lag machine" and I can't reproduce the bug. Technically, you're supposed to be able to jump higher by holding the jump than just tapping it, but PurpleMetro's screenshot shows a higher jump height than what should be possible.