Normal for droop after flush?

Just did a mini flush on my plants before hitting flowering soon.. they are in 5-7 gallon bags.. gave them 1-2 gallons which for some is a normal watering but anyways they are drooping after the mini flush is this normal?

I wouldn't call that a flush , just a good watering with plenty of run-off .
It is normal for plants to droop when over-watered and the fact you refer to this as a flush would suggest it's a lot more then you normally water with so yes I would say it's pretty normal and they should perk up soon enough IMO

as long as run off is allowed to escape you'll be fine. If my plants got pissed at my water I'd think it was the water itself.
like, if you live in Flint........

Normal