Delete key on num pad giving issues

Hey guys, so I just got my k70 rgb the other day and I was tinkering around with my profiles, and I made one mode as a rainbow. It looks amazing and works perfectly, barring the delete key on the number pad. I made sure about 20 times that it was part of the group that has the rainbow wave assigned to it, and that that key has no other actions assigned to it. It still only remains the background color and refuses to do the rainbow like every other key. Does anyone know what could be causing this? Thanks for any help.