Penalized for leaving track on Lime Rock for catching air

No joke, came around the sharp corner and was going up the hill and in the middle of the track the car lifted off the ground at the apex of the hill. All sudden I get the penalty of 1.5seconds for leaving the track. I looked at the replay and sure enough I was dead center almost and the only thing was all four tires lifted off the ground that’s the only thing I can think of that was seen as me “leaving the track” would have been.
Is this legit or a bug or just a misunderstanding by the penalty system? Anyone else have any issues like this?

Would it be possible to provide a video of this in action?