Auto-Setting Trim Tabs

I have a problem with several aircraft with auto-setting trim tabs. Whenever I try to climb or dive, the tabs quickly move themselves up or down, depending on whether I go up or down. What canI do about this?
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No, the autopilot is off. The tabs move all the way up or down when I move up or down. I rarely ever use the auto pilot, and when I do, I usually don't have it set right, so I turn it off.