By the looks of it there were earlier impatient buyers who drove up the price, which caused more sellers to dig out their PTS to capture that higher price, which increased supply and caused the price to go back down
I did the same thing personally when PTS first started trading, didnt know what to pay so I paid .01 which brought tons of sellers out but few buyers except me, the price went down as low as .002 before buyers came in and started creating a market (and I bought for .002 and sold for .0035 in quantities of 1000+)