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It maybe that the pin/screw in the join where the two objective braces meets the central shaft is loose.
I have the exact same pair but have not had this problem.
Mine have a problem with the right hand eye lens (diopter control) being very loose. I can move it up and down and left and right. It changes the collimation if I bump it and the eye lens ends up on the wrong angle to the rest of the optics, makes me go cross eyed. As long as I make sure it's in a certain position (which I have since worked out) all is OK. I'm still happy with them, they are great for the money.
Your problem sounds like something as simple as a fastener somewhere in the brace. Have a close look around and see what you can find, or call AOE....
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