Rust spots 2 weeks flowering

Im getting some rust spots on the middle leaves. Anyone seen this? I just flushed 1 with ph'd 6.5 water, but want to be sure there not just being under fed.View attachment 2207097View attachment 2207098

I've had this issue on previous grows, Are you dosing with CAL-MAG Every other watering? If not, you may want to look into doing that. Also what type of water are you using? If you are using a water filtration system on your tap water, that removes all calcium/magnesium out of the water.