Hi, it seems you have been open by saying that you are only dealing with closing only on GME and AMC. However, to me it seems that if most stocks are showing some increase or spike it suddenly rejects any buy order and says Closing Market Only. This can happen at any time after market opening on UK or US markets and restricts the spread betting options. Just this morning for example on PNPL, my order was rejected several times saying Closing Market Only when it was after market open at 8.30am GMT.
Is there any reason for this, it has happened daily on different stocks for at least th