Sometimes Push Start doesnt start.

somms

I know this sounds dumb, but my muscle memory has me putting on my seatbelt and hitting start at the same time. Foot is on the brake and clutch is pushed all the way in, but sometimes my butt is lifted off the seat a little so I can fit the belt into the lock, and the start button just goes to ACC, and I have to hit it again before the engine starts.

I'm convinced that there's a butt sensor in the driver's seat that won't start the engine if it doesn't think there's a person in the seat.