Another deficiency

It's probably your environment and not a deficiency my friend. VPD can make your plants look deficient when in reality it's just your VPD. Be sure you have enough humidity during the first few weeks of bloom...they still need about 60% if your temps are in the mid to upper 70's

Have you gave recently more potash or started heavy flower nutes ? Think there is a problem. Thats not deficiency, thats burn, excess.

Looks like a slight imbalance somewhere whether that be in your nutrients or your ph its not enough burnt ends to be an overfeed and I don't think by the shade of the leaves its an underfeed. I would suggest this is nothing to worry about and would probably sort itself out in the next feed. It could also be stress. you have very large internode spacing and looks like you have gone heavy on the defoliation while she's in flower this will probably do you more harm than good buddy. what kind of light are you using? Are you hanging it at the correct height? this is all just my opinion someone else may see something different. Best of luck anyway buddy :)