Toggle Button Assignments Performing Both Actions

[shollystuff]

I'm trying to set up my new Novation Launchkey controller to use with Reaper 5. But when I assign any TOGGLE action to a button on my keyboard, it performs BOTH actions when I press that button. I can successfully assign a single action (Like PLAY) to a transport button, but if I assign the PLAY/PAUSE action to a button... when I press that button, it starts to PLAY, then it PAUSES. Also, if I assign a NEXT TRACK option to a button, it jumps down 2 tracks instead of one. Anyone know why this is happening? Thanks

[solger]

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but if I assign the PLAY/PAUSE action to a button... when I press that button, it starts to PLAY, then it PAUSES. Also, if I assign a NEXT TRACK option to a button, it jumps down 2 tracks instead of one.

So does it only execute 'play' when you keep the button pressed?
In this case have a look at the Launchkey manual if there's any info about how to check/change which MIDI parameters (MIDI CC, Note, etc.) and Behavior ('Momentary', 'Toggle', etc.) is currently assigned to this button.