Smells like poop

I just found a dried up piece of cat poop on the floor in the middle of my room. That explains why my room smelled like poop a few days ago. It really smelled like poop and it was bad. At the time, I couldn't find the source and I didn't think it was Tiki because I know that she took a poop in the litter box that morning and it didn't smell the same. I thought maybe b/c it was windy that the bathroom vents were flowing the wrong way.

My worry now is that the poop I found was a broken off piece and I still don't know where the rest of it is. Also, how did it get to the middle of my room?...