Welcome, and glad you found us! Congrats on your new adoptee!
It's a common problem with little wee'uns who're uncoordinated and still learning. My Mozart and Pixie did this when they were young also. They haven't figured out to go forward first before circling around to cover. They both outgrew it, but one thing that could help is a really big litterbox, so they can circle around better. I know it sounds funny, they are so tiny, and the box seems big enough already. But go much bigger.
I was lucky, I was usually around and could hear when they were going, so I'd try to have a scoop ready to get it out before they stepped in it, or I would let them step in it so they could learn, then grab 'em and wash their paws. Thankfully I only had to do it for a couple months. Meantime, lots of Clorox wipes and trying to figure out where they'd been walking!
Good luck, and I'm sure other members will have more suggestions for ya.