yeah this is strange but happens to me too.Each time I sell my bitcoins later I see some rise in price and I always think would have good to wait for little more.Why price goes up always after selling.
This is because an efficient market always moves to minimize profits. In this way, it can be understood as a crowd-sourced, adversarial intelligence.
Thus, in fact, even beyond confirmation bias, it is theoretically more likely than a coin-flip for the market to punish informed, strategic speculative actions, especially on the short term.