Now what you bought may suffer for SAME core reason
Lots of traders - prices on the edge and direction and momentum - are highly leveraged - margin
Stocks with a price - depending on brokerage (and maybe SEC or ?) below 3 or 2 or ? in PPS do not provide a dime of equity to soften the borrowed amount !!!!
so those may well be sold by those over leveraged first and largest
the stocks you bought - if they have margin value at the same level (50% or so) as big American companies then you aovided the margin selling
If they are not eligible or low priced - fat to fire