I'm afraid I'm not sure what's going on, I'm sorry! I haven't seen that problem before and can't imagine what's causing it. Maybe if you post a screenshot or link to a video here I'll be able to take a better look.
here is the video, at a certain point i press enter and it opens the patreon page but the video was still recording the game window:
https://drive.google.com/file/d/1Y7USaPDa4X7JTwjszMTjrGBrzLc7Qwws/view?usp=shari...
I know! It's steam input fucking with the controls as it is wont to do for a lot of non-steam games, including some emulators, iirc :P
You just gotta unplug/turn off your controller if you're willing to use keyboard, but if not, I think you might have to either exit steam or restart the computer entirely lol