SYME order still pending?

My order for SYME has been pending for hours which has not happened to me on hear before with this stock. The price chart has not changed at all but people on other platforms are able to buy SYME easily and their charts are changing with the times.

keeps happening with quite a few aim/low liquidity stocks (or whatever) in t212. HL and Freetrade seem to be able to execute those orders without any issue. HEMO and KOD another few e.g.