Can't change certain parameters in QGC

Hi all I’m trying to further limit my MPC_TILTMAX_AIR parameter to limit how much my UAV can tilt in flight to prevent it from turning onto itself.

When I try to reduce it from the default it just changes back to the original value. Has anyone faced this issue and know why it behaves like this?
The same pattern is also seen when I try to change any of the MPC_ACC parameters.

Thank you!