I think everyone loses one to jumping at one time or another.
I had a Yasha that was perfectly fine for over a year in the tank & then jumped into the back chamber of the cube after a water change. I didn't see him so I opened up the top & there he was looking at me. I bent the net & fished him out, little brat popped right back over & I swear he was smiling at me when I opened up the top again. I made him spend the weekend there.