The Gaming Scientist

I'm trying to make a small craft with tilit engines, for fun. It uses the smallest servo, that's how small it is. Now, there's 2 of them, one on each side. And in the SPH they both work fine, but once I launch, the left one just won't move. I trieda lot, manual rotation, removing from symmetry, placing separately. Nothing works? Anyone else experience this bug, and does someone have a fix? Power and electricity are not a problem, and the exact same thing on the other side does work...