Why is my order not executed at LSE / RBW

Not sure this is the right place to ask. Let me know if there is a better sub.
I placed a limit order last Friday at 15.80GBX for Rainbow Rare Earth ltd (RBW / GG00BD59ZW98). While my order was submitted at 10am there have been multiple trades at 15.50 and 15.70 but my order was not executed. How is that possible?

Maybe relevant: I'm using dutch broker Degiro

Edit: typo
Edit: added trade info