@MojangSupport My realm's called monocat, and upon visiting the realms page I encountered this, something I'd never seen before- upon loading the realm, I had an entirely new skin, and the world loaded was not the one I had previously set to load. Second time this has happened.

In addition: after switching back to the originally set world, I spawned in a place I'd never seen before, with over 67,000 levels?? Still retained all of my items however. Still wearing the mysterious skin.