This can be fixed - several people had this problem, usually the ball bearings need readjustment. There is something on this forum about it, and several videos can be found.
Edit: this seems to be a good starting point: Excessive play in x-axis linear module bracket - and this seems to be an official guide: https://support.snapmaker.com/hc/en-us/articles/1500000110341-What-should-I-do-when-the-carriage-slider-of-the-linear-module-is-loose-