I doubt there's any retail shorting here. I see the short interest is currently 22k shares.... probably just some unsettled trades. I tried checking at iab to see if they had any shares available, to no avail. Maybe their system isn't working as it used to...hadn't tried to check with iab for a couple years. https://www.otcmarkets.com/stock/MXSG/short-sales
By the way, I've never shorted any stock...and surely wouldn't try with this one. Seems it should take off at some time.