Interesting indeed..... I'm pretty sure that's the exact bug that I encountered the first time I played (which was like, a couple days ago maybe?).
It's like the cards get randomly stuck in the middle of the screen for whatever reason (or atleast in my case, they were in the middle of the screen). I think it happened when I pulled the stomach card into the inventory slot. Either that, or maybe I was moving all the cards around too fast for the code to keep up; while I was trying to figure out how to play the game.
But yeah, you can look at the cards, but you can't use them in any way and you can't pick up new cards. It's a pretty game breaking bug. That can get fixed by reloading the page again, but then you'll lose all progress.