Today i swap wheels and i replace stem on my road bike. The stem is was 120mm i put stem 100. Now when i ride the bike i feel the fork is not stable like in speed 25 miles. I had the wheels in my other road bike and no do that problem. Is can do that because the stem is shorter.? Plus i notice the fork is more tight now i lose the stem but the fork stay tight. Is turn left and right but when the wheel is straight is stay like that even if i pickup the wheel from the ground. How i can loose the fork.