R30R : We have seen ER traps before. The results may be priced in. However, bigger instos tend to kick the dust to have retail investors sell off and then see the price increase in a bounce.
The whole market mechanics are rigged. It comes down to who has nerves of steel and, when taking a loss, the skin of an ox.

R30R : Many holding for their jackpots aren’t able to sell that high.

R30R : You may have a standing order (perhaps a stop loss or take profit or a limit order) already placed and not yet filled. So check if there is one and cancel it. It is essentially telling you that you don’t have the position available to sell.