Not much happening in PPX currently, however i find it a bit...

Not much happening in PPX currently, however i find it a bit strange that as soon as the share price make a move upwards
someone almost always sells it down.
for instance today there was some reasonable buying at around 10% higher at around 4.3., because the spread is so far, someone sold just a few dollars worth and brought back down to 3.9c

i know its petty as there is almost no volume, but why would someone sell at 3.9c immediately