Cant sell, stuck on processing

Made a limit order on $MARK cant close it. its processing. Cant even sell shares on market order now.

I have the same issue with market orders for LHN (SIX Swiss)
Orders for OD7F (WTI crude oil) however went smoothly (Xetra).

Edit: LHN orders were executed after a few minutes (luckily the price moved to my favor)
New limit sell for OD7F however is processing longer than usual.

Same problem here took 15min to execute an order also app was down for a while!!