Static price on T212 only

Why do some prices not change on T212 while they are actually changing in reality? I’m thinking specifically of Superdry, which stuck at a specific price for about half the day even though the market (UK) was open. It has happened twice so far. When I check online the actual price of the stock has changed a lot. I’ve noticed this with one or two other instruments but Superdry seems the main culprit.

Same issue here, t212 has been stationary @ 104.4 all morning but the actual price was fluctuating between 5-16% above this & could only sell at yesterdays closing price 100.4