There have been some ongoing changes with Animations that has changed the feel of the game. This is mostly affecting Animation Canceling. Your timings will need to be adjusted for this. Each patch seems to have tweaked the animations although they have not specifically said anything.
I have also noticed that lately, it takes longer to leave combat, as where the mobs are dead but it takes a few seconds for me to be able to loot a nearby container. Mobs seem to loot just fine, just containers.