Whenever I start a game on voobly playing Age of empires 2, the mouse sensitivity is higher or has mouse acceleration, I cant tell which it is. But when I play AOE2 on steam, my mouse is fine. Its really annoying.

i would even call it lag on the mouse, the reaction time isnt instant from the mouse. Like it the ping affected my mouse speed,which makes no sense

hi, try to modify the DPI of your mouse, and also configure the sensitivity of the mouses in game settings.
Greetings!

Also try enabling the "custom normal mouse" option under Game->v1.5 RC->Game Mechanics. This can help with mouse behaviour.