KMG-12 Incorrectly set (big ENTER and '#)

Hello,

I got the KMG-12 Keyboard with the german layout.
I got it on christmas day and the next day it really worked well.
But on the 3rd day i noticed that my big ENTER button and next to it the ( '# ) are swapped.
I don’t know how to fix that.

Would be nice if someone can help me.
Thanks for paying attention.