I agree, it does happen. However, if you look at the short sales listed on OTC for each stock, it's a relatively small amount.
If I'm not mistaken, OTC lists short sales twice a month and in the case of EVDR it doesn't show any since mid July. The last date recorded was July 31st, and on that date it shows zero.
I guess my point is when most are blamiing a bad day on shorts, I believe that it's manipulation by either retail or the MM's.
I try not to let this stuff bother me and if anything maybe take advantage of it.
IMO, when a stock has a reason to move up, there is little that they can do to stop it. (for long)
Good Luck!