Keeps happening end of veg..

using earth juice nutes, not sure what's going on. Plats were looking awesome a week ago, put them into the flower room, and now there looking like shit. Thought they were over fed so I gave a couple straight waters with no change, which led me to think they we're under fed. Now I gave them a good feed last night and today there looking about the same. No bugs, or anything. Can't seem to put my finger on what's going on. Seems to keep happening towards the very end of veg or right before flipping them.

they do look nitrogen def. in my opinion. you should keep up the grow formula for 2 weeks into flower and slowly transition. anything else different in the flower room environment wise?

Feeding from themselves, agree with @Growdict, feed them.....