Having 2 "keyboards" shouldn't confuse windows. I routinely use 3 or more, plus some stream decks and a foot pedal, and windows is fine with it.
Your laptop's USB capabilities may be getting stressed though. Try using the shortest (and high quality) USB cables that you can, as that can often make the difference. USB signal can degrade surprisingly quickly over distance.
I'm guessing that your mic already has a long cord, so routing it through the monitor where it has to go through an additional cord may perhaps be contributing to your problems.