This is an issue that i encounter often. In the attached file you see the issue clearly. I rotate a cam with attached rods, pivoting around two connectors. In the first rotation works as expected. When I mirror those three animations (I tried to mirror those one by one and also all at once), the mirrored animation falls apart. Any ideas why that is and what can be done to avoid it?
PROBLEM SOLVED
And how do you solve the problem? Did you deactivated the dynamic pivot option?
After all animations were mirrored, I had to go back in, reset the pivot points and reselect them. That solved the issue (still not sure why the original pivot points reacted so differently)