Joystick slew mode problem

I have two joysticks set for slew mode so I can freely position in a specific spot, with translation axes set to the left stick and attitude on the right stick.

The aircraft begins moving if I push the stick, but as soon as the stick is staying at one specific value, it completely stops moving. If I want to keep moving, I have to keep jiggling the stick in that direction.

Very strange behavior. Anyone know what might be causing this and if there are any workarounds?