The engineering sentry drone become more beautiful with two wings, but easier to stuck on around model with those wing. One possible solution is turn off drone’s collision function, let it can be penetrate other models. I remember there was one patch that all drones can penetrate other, but with its attack function is keep situation of the target, it must be shoot in sight. Now drone’s attack function is keep surrond target in orbit, so it’s all right if you turn its collision possible.
It’s a known bug. We are working on it.
Please, next time submit bugs according the Bug Section instruction.