Mirror and custom curves not working/saving? v5.5.78.50

[SAMMM]

Hello! Have a SpaceMouse, been enjoying CMJ so far! But I noticed the mirror function for the curve adjuster doesn't work, and any custom-adjusted curves do not save.

Curve presets however do save, assuming I don't adjust them manually after.

I watched this video and it's working there, so I'm not sure what I'm doing wrong, as everything looks fine in the example video.

Any thoughts? I'm not quite sure what I'm doing incorrectly.