Is the attack move command broken?

Before, when using attack move (R), selected units would attack anything in LoS instantly (As they should). Since the update it feels completely broken. They do not attack at all and instead awkwardly move towards the clicked location, pause for a moment and then attack. Like I can be right next to many enemy units, click attack move almost right on them and they will walk around or even into the group, towards the location without attacking, then just stand there idle for two seconds, and THEN attack. I don't hear anyone talking about this. I have verified the game files etc and nothing seems to be wrong. Anyone?