Was it perfectly healthy before you left?
You could be right but, I from the looks of 1 pot, it looks VERY low on the amount of soil. How old are the plants? What size pots are they? Looks low on soil. Root bound? Not enough water? A lot of unknowns.
Again, if your looking for answers to your questions you need to let us see what you got. Pics please
I would have to disagree on your issue with lights.
I highly doubt your blurples did that to your plants. What temps and humidity are you running? Do the pots your using drain? Can't see the bottoms. Are you pulling air from your tent? Where is the fresh air coming from?
Why do you think the buds are very underdeveloped for 6/7 weeks into flowering?
Wait... So these plants are in week 7 of flower?
Unfortunately