This is due to the way your TrackIR profile is configured and not something to do with the game itself: moving to the side "injects" a bit of sideways motion too that moves your viewpoint closer to the canopy.
I think there's an option in the trackIR software to control how zooming works, you can choose between "game-relative" (moving left when looking left will also zoom in) or "yourself-relative" (regardless of where you are looking, zooming only occurs when you move closer to your monitor). I can't remember the exact name of the relevant option but it's definitely there.
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