If you inspected the top box OK there is nothing wrong with your bees.
Agro bees start agro, they are agro as the lid comes off and Jims method works.
But if you can inspect the top box, then what has been your smoker use during the inspection? When you took the top box off did you give them a puff to say its OK girls, just want to have a look.
If you work without gloves, bees will head butt your hands as they start to get upset, so a little puff to say settle down.
Temperature, wind, did it rain yesterday, honey flow all affect bees and their temperament on any day.