That’s the 5 of spades, I would say.
I’m guessing its a crappy fold card.
I have the same problem all the time.
Near the top of your screen, usually on the right, you’ll see a “circling arrow.” When part of a card, such as the suit or index number, is hidden, click that arrow during play to rotate your view until the index is fully visible. I use it that way to see the suits, sometimes as I like to arrange my seat as being “bottom right” or “bottom center” of screen. Moving one table seat clockwise makes it visible from that position. Once I know what it is, I can click a few more times to go back to my preferred spot.