I am using GIMP on iPad Pro with Astropad. When I click a new tool to use, it shows that it is selected but when touch Apple Pencil to screen, it reverts back to previous tool I was using. When I lift Apple Pencil off screen, it changes to new tool I wanted to use. It keeps doing that until I click with the mouse on iMac on tool and click on iPad Pro with Apple Pencil then it manages to stay most of the time. Perhaps Astropad is not saving something correctly?