Strange rotating rigging issue

Basically there’s been an issue that keeps happening in my rigs to where when I go animate them and try rotating a part of the model, the entire body, but the part I selected, rotates uncontrollably.

In this case, I’m trying to animate a bird model but whenever I try rotating a piece of it’s right wing, the entire body is instead the one rotating.

If anyone else has had this problem and knows the solution to it (or a way to avoid it) then I’d be very thankful to finally get this bug out of my sight and not have to ditch any more bugged models.

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