Handle bars don’t return
Your steering geometry has obviously been messed up by the installation of the new fork.

I'm guessing the new fork is longer than the old fork.

An old RockShox suspension fork would have very little (by modern standards) travel, and the distance from axle to bottom of the head tube would not be much greater than a rigid fork. Modern forks have longer travel, are designed for bikes with higher head tubes and are significantly longer. if you put a longer fork on a frame it pushes the head tube up, increases the head angle and positions the front wheel too far forward.