I need help, why so much stretch?

It’s Barney’s LSD. Actually, I have a stat sheet for you…
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They are fabric pots using Dyna-Gro nutrients
That plant is from seed and this it’s original pot, no transplant. When I flipped, there were two open squares around the perimeter, and the plants were about 4-ish inches above. I still tucked the next day or two after flip. I was keeping a journal on them here …