Maybe turn off head shake?
Nonetheless, I have to readjust for shifting in the track ir as well by pressing f12. I don't think it's a bug, just me moving my head a little out of center, I find the track ir for this game quite responsive and nice, so the slightest shift of your head, i.e. sitting a little different in your seat in front of the monitor, will have you recenter your track ir.
At times these might be unconcious changes in position while trying to keep a visual on a target or just turning while aiming.
And then of course it depends a little how you have your track ir set up profilewise.
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