In DayZ PC 1.07 track IR is all but unusable. Myself and two other friends all have TrackIR and all experience the same issue.
Track IR will snap the view in strange places and will not respond to head movement until I roll my head around for a bit and it seems to "recenter".
This is particularly evident when my character enters a building, or doorway, but happens very frequently to the point where we have stopped using TrackIR in DayZ.

It used to work fine. I can't for certain say in which release it was broken, but sometime after March 2019.