No it is not the select key. I am unable to navigate at all. I can see what you are saying when you say it is acting like a mouse and not a keyboard. The weird thing is how fast it is putting the commands in. All the scrolls and mouse wheels happen in less than .1 seconds.
An extra device is strange. Like I listed in the initial trouble shooting steps, I removed everything except the remote dongle from the Pi. No mouse, no keyboard, no HDD nothing but the dongle.
Let me try another test once I have a chance. Should be the next day or two. I’m going to see what devices are detected if I plug the dongle in AFTER the whole system is booted and running. Maybe that will shed some light on what the dongle or the remote is doing.
Also going to try in with just a mouse and see what kind of inputs it sees. See if that is spamming or if it just the remote.