Every time I enter split screen mode my custom controls get messed up when I enter full screen mode

Whenever u turn on custom controls in the settings and go into split screen or or change the size of the game on screen in any way and open the game in full size again your controls will no longer be the same way they were at first. To recreate it 

Step 1: go to controls in Settings and turn on the first switch in that menu 

Step 2: go into a split screen of any kind 

Step 3: go out of split screen and open the game in full screen when u go into a world again your controls will no longer be the way they were at first