The settlement period for a trade is 2 or 3 days....meaning after someone agrees to sell shares they have 2 or 3 days to deliver them, and if they can't locate the shares these forced buy ins happen.  I don't think we've seen the end....over the past month house 100 has been the biggest net buyer of RVX.  

This site has naked short data for RVXCF....same Elben Group behind the shortdata.ca site:  

https://www.otcshortreport.com/company/RVXCF