character movement velocity negatively affected by framerate

Lower framerates directly affect the velocity of a character's movement if that velocity is provided by another source.

1. Download, unzip, open project at link:
[Link Removed]
2. Press PIE
3. Move character to lift to cause lift to move upward. When the lift reaches the topmost point, press spacebar to jump (note jump height)
4. Press ~ > type t.maxFPS 10 > press enter
5. Perform step 3 again

Results:

Jump height exponentially increases at lowered framerate

Expected:

Jump height remains the same.