Castlevania Dawn of Sorrow control issue on Desmume(DS)

When I try and play it the Right Move Button does not work and when I try and Change which Button I want to use it comes up saying it’s already use and Key Button Keeps Disappearing so can’t use and get out of the Menu.

Also does it on Desmume 2015 Core.

How can this be Fixed?

Video of What Happens: