Midi Controller pressing pressing twice instead of one

Hi, Guys I'm using a Novation launchpad mIni as a shortcut device for Photoshop, I think it makes the process way easier, so instead of having to memorize and press 2 or 3 buttons simultaneously I only have to press one.

The only problem I'm having is that when I press a key, it is as if I've pressed the key 2 times, once when I press and another one when I release the key. I tried the options "Send key down only" and "Send key up only" (Not sure if this is used for this) with no good results, It will work only once, then if I press it again it won't work.

If someone can give me some advice, or solution would be very much appreciated.