This is easy to explain. They saved money and did not filled all of these adapter screws I highlighted in my picture.
I Had the old frame which was quiet wobbling as this is one of the first devices of Kickstarter campaign. So i wanted the new frame for printing and just switched all screws from old to new frame. So the wobble one is now for CNC where it is not that hard when I have ±0.5mm.
And for sure. It is a weak from snapmaker that they don’t Install these 8 screws from factory. This is 1$ extra. And now they have to wrote that note in the document and all think"wtf?". I cant understand that. 