I am not 100% this is what you are talking about. but I think so. Weapon power sets draw time has to do with if you are in combat or not. If you are in combat, their draw time happens the first attack, then goes into "snappy" mode. It will last until you leave combat then you must "draw" again at the start of combat.
They did this to fix draw time complaints with powersets. It was a real drag when draw time was every single time you pull the weapon out.