I have the same remote and ran into this programming my new Roku Ultra. What I ended up doing is disabling the continuous output for each Roku button pressed and changed to a single ir output for each button instead of the default 3 ir outputs each time any button is pressed. This made each button press only register once on the Roku with the only downside being that you loose continuous scrolling with holding down a button. I ended up assigning a few other buttons with the arrow commands mapped to them and left the default commands (continuous output while being held down) if I wanted the scrolling ability. This is the best I could figure out for now.