more information will be needed to help, what exactly are we looking at(it looks like the underside of the heat bed)? i assume the issue is that the nut is loose? or is there more to the problem? what size model do you have? also have you emailed support about your issue?
If I am right this nut is from the aluminum base frame. This tells me that you mounted the base upside down. If I remember correctly from some posts on the forum, the nuts should be facing down. Turning the base frame the right way will increase the flatness of your heated bed and will prevent you from screwing out those nuts when you disassemble your working platform.
(I don’t have my snapmaker yet. This is just knowledge from strolling through the forum)