Hello sir, terribly sorry for the trouble.
I have a shoot first, ask questions later approach to problem solving. I'll EVENTUALLY figure things out, but not without some chaos along the way.
Your problems are almost certainly being cause by Interception.
Here's the thing: Unless you pay for the commercial licence, which is $2,200, your computer is now limited to only 10 of each device type (as shown in your device manager)
I did not know this until a few weeks ago, when I did some digging, after having odd problems of my own, and hearing about problems like yours.
Since then, I've updated the description on that video, with instructions for how to uninstall. It's very easy. You just follow the same steps, but type /uninstall rather than /install. Also, you have to delete keyboard.sys from system 32, first, if it doesn't work because that file is "busy." No, it's not a joke. Don't worry, keyboard.sys is not a normal Windows file -- your keyboard will work fine afterwards.
I'm going to make a follow up video with these instructions.
Again, sorry for the trouble!