Pi not allowing delivered stock to be squared off

I tried to exit AVANTIFEED stock yesterday & today, but Pi repeatedly tells me to 'select a row to square off position'. It just doesn't allow the square off order to go through. See the screenshot attached.  I've kept the row selected yet it's showing the same message. I'm able to put square off orders for other stocks, but not AVANTIFEED. Logging out & logging in again didn't help. Can anyone help?