Shutdown menu blinks when is accessed by remote

I have a Raspberry Pi 1 Model B running OSMC (Kodi 17.2) connected with this remote, when I press the POWER button, left panel appears and disappears until I press another button (if I access to “shutdown panel” through OSMC menu no blinking is showed). I recorded a video showing the problem.

Is it posible to fix that? if not, could I disable the shutdown button changing the keymaps?

Another problem I have is the NUMLOCK button, that blocks all buttons on the remote. Is it possible to disable it editing the keymaps?