Hmm, the first thing I’d check is your plane constraint settings on the projectile movement component and see what the setup there is. The overall idea is that we want the ball to be constrained so it doesn’t move “out” of the playspace, making it essentially 2D in terms of movement.
Good catch on the velocity settings, that feels like a leftover from me building the project and trying some stuff. Setting it to 1 should be fine.