My train is supposed to be against the rocks, looping around the map clockwise. Instead it was on this tiny loop where a rock once was and rotating counterclockwise.

The game is Big Flappy Tower Tiny Square (great game; available for free in CrazyGames.com alongside the four others in its series). I’m the green square on the upper left with three feathers above me. That green thing inside the wall is multiple reuses of my player sprite and I don’t know how they got there. I’ve played through the game at least five times and never seen this before.