Sometimes quitting to menu during a run and then starting a new one makes the seed get stuck at fixed x position and jitter back and forth, kinda like when something's stuck between overlapping colliders. Then there's a copy of the seed helicopter sprite at the seed x and the camp boundary Y. If you move through the boundary (seems to be no collision when this is happening) then things go back to normal.
Sidenote: having a great time so far!