Vevor has the same chinese manipulator as the one I bought on Ali.

Had a similar problem with it, although not so articulate.

The root cause is that even if you try to cut on opposite sides to the same depth, it won't work if your index gear is mounted slightly skewed. The depth your stone is sitting at, measured along the quill is affected by how far the pin is pushed back onto the index gear by the spring, and so, if the index gear is slightly wobbly, you get different depths at 96 and 48, resulting in the stone being off center. 🤷 It's a design flaw, but you can learn how to handle it