I’m not to sure if it’s the weight of the bud ...

Grow CN has it right

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Airflow not only provides CO2 and takes away humidity and oxygen but it also strengthens the plant mechanically. It is like being out in the wind. If the plant is buffeted from a young age it develops a strong stem and branches to withstand the wind. Later in life those stronger branches can better support the weight of flowers. Also, way down near the bottom the branches can stretch more trying to reach the light, causing them to be longer and less strong.

Not enough air flow to strengthen the fibres in the branches, maybe weak light too, causing stretched weak branches. It wont matter though, they will grow and mature as normal. Wait until the calyxes split open to reveal the shiny brown seeds inside before harvesting, seeds take about 5 weeks to mature and will not mature further once harvested. They then need about a month of drying in cool dark conditions before they are ready to plant. Wooden bowls are best for drying the seeds, any excess moisture will be absorbed by the wood and will prevent spoilage. It is also a good idea to give the seeds a stir every couple of days so that any seeds at the bottom of the pile get access to fresh air to help with the drying process. Congratulations too for having the courage to breed your own strain and for being able to ignore the dread and panic a male plant can induce in some people! Hope this helps, Organoman.

Hey buddy that's def from not enough air flow . Air flowing on it in early stages to strengthen her up or training methods. Bending. Pinching supercropping etc . Will prevent that in the future and a bit more.elighr penetration or stronger light will help !! Cheers best of luck !

It looks to me like she is stretching a lot from the light/flower period, Maybe it was to far away in the beginning when those branches formed or that's just how the plant grows. I would support them with some string to something higher up. Don't want them lower branches to snap off. Best Of Luck!

If I had to guess.. I’d say too high of humidity. Flower is usually 45-50%