Your plant may yellow out in flower week 5 so your really week 4 probably . You want to aim for a healthy green plant. Back off the nutrient
You should try and list your medium your using, your watering schedule and nutes as well.
To me it looks like a nute difficiency (nitrogen), and under or over watering. With either watering issues leaves tend to droop. I wouldn't worry so much about the leaves but it may affect your speed and growth of the buds.
Everyone opinion is different on nitrogen through flowering but it does need some. May want to look into something like general hydroponics beastie bloomz. Id say drop your reg nute ppm in half and replace with that. It has a good amount of nitrogen but a whole lot more phosphorous(p), and potash(k).
Someone may have a better nute alternative too so its again just my 02.
looks like a def. then Over feed ~ I would Pluck & see if it happens too any others ~
what have you been feeding them?
again everyone has there opinions on watering for soil. I am no expert in soil but it is where i started. Some people think its better to let the medium dry out a bit so that the roots search for water. I on the other hand prefer to keep a moist soil. Like now you are depriving and stressing the plant especially in flowering of water. Vegging is where you would want to let the soil dry a bit if anything if you think that helps roots. I think the roots grow no matter what and never have a problem. There growing twice the rate of the plant always so they grow just fine.
feeding with just tiger bloom is where the deficiency is problem coming from. You want to have a little bit of n in there. As for feeding molasses the whole time i dont think you need to do either. Just the last two-three weeks of flush depending what your preference is. This is where you let the soil get dry and bit before feeding them molasses. Then when you water them they are going to be bone dry of everything and go sucking up just the molasses and you will see the buds blow up.
Do you have a pic of the whole plant? That is a old leaf it was time for it to die. Not sure how you can diagnose without seeing the whole plant or at least more of it.
That tiger bloom isno joke.
looks also like perhaps mg def. add one tsp of epson salts, to one gal of water.
Yes. That tiger bloom will get u by. It says to use more than you would really want to use tho. If your looking for a cheap nutrient get age old gold. It's truly organic and is strong. 10 bucks for a bottle