Appears its an old known issue https://forum.dcs.world/topic/329127-known-issue-trim-does-weird-thin

ED Forums
When on the ground, if I move to the back seat, when I move back to the front seat the trim position will be completely changed. It looks like it alternates between 2-3 degrees nose down and about 22 degrees nose up. If I go to the back seat then immediately push "F2" to go to the external view I...
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