maybe temps arent dialed in and vary from previous grows. Ive learned that cannabis plants crave a 75 degree room with 35% humidity, with a little dip in nightime temps to bring out some colors. Bring the temps up to 82 or more and i see lankier plants with more stretching. The buds dont always connect right and can be stringy in high temp environment and/or they're too close to the light. This can hurt yield as well.

Did you keep the lights higher last time? Did you water more or less? ..............these are the trials and tribulations of being a marijuana grower. Every grow we are challenged to improve on the last.

The more fresh air the merrier, plants will use up all of the c02 in a sealed room eventually and if you don't more fresh c02 rich air your yields and plant performance will suffer.