Mounted seedling has two new growths, and they're on opposite ends of the mount

[Roberta]

For now, just observe. If it starts to grow off the mount, best is to tie it to another mount. If you have a lot of empty real estate you could just saw off the empty part of the mount, and tie it at the bottom - not wasting it, just relocating. And this is a learning experience, watching this one. Your placement will be be better the next time (unless the plant fools you, which they do... frequently). But don't try to unmount it, it is growing very well.