Assassination Rogue Posions dropping off zoning out of dungeons?

this is new within the last week or so… every single dungeon ive done upon leaving i must re apply poisons. when entering torghast i have to reapply posions… this has never ever happened in the 10+ years ive been playing wow… the poison that drops off every time is leathal poison… numb or crippling happens every once in a while.

its been like that for a while even before shadowlands… just apply poisons lol takes literally 2 seconds

mine literally started the other day… hence why i asked… i re apply them… but why is it both arent falling off then? that makes it seem buggy and not a thing thats always happened