What could be the problem here?
It looks like the heat break might not be tight against the nozzle, which leaves room for filament to come out the top side. Did you build this toolhead, or did you buy it from Lulzbot?
I changed the nozzle from .5 to .25 month or so ago.
(It’s a stock Mini2.)
Cleaned block and reinstalled nozzle. All good now