Glad you got it sorted out. And yes, I'd expect a lot of fuel to shoot out of the carb when the engine is running backwards.

Fwiw, most (if not all) 2-strokes can run backwards, they just don't do it very well (because of the port timeings). However, as you discovered, some do it quite well, espeically when new. If you are hand starting, and it keeps running backwards, try flipping the engine backwards, and it will kick and run forwards.