Custom hitbox error

Me and my friends are making an RPG but for some reason whenever I use the custom hitbox/custom collision mask option if I save the project and close gdevelop when I come back the hitbox has either reverted back to normal but still says it’s changed in the edit object tab or it has glitched out entirely, for example, the hitbox might not even be on the image anymore. If you have any idea what is happening or how to fix it that would be much appreciated