Uneven budding on same plant

I have this plant. It's basically a mainline. It came out of the ground looking retarded, and had retarded growth for a while, but it came out and the stem split like a manline on its own and grew at the same rate for each apex the whole time. Thrn it fixed its retarded leave growth and grew normal. then when I flowered it created problems again. The one side of thr plant is making full robust buds. But the other stem for the mainline, is creating a really wispy weird thing. The weak side I have in the best light coverage. It's right under the light....still wont develope. The other side is though, growing strong. Good resin production over the whole plant. But no budding A few pistils at the least.
Hopefully the pictures do it justice.