hairs turning brown 3.5 weeks into flower?

Some of the bud hairs are turning brown already, but my other two girls tey are still all white. They have only been flowering 3.5 weeks, so they should have another 5 weeks yet. Is she gonna finish too soon or is it quite common for some hairs to turn orange way before the bud start putting on acctual weight?

Thanks for help

Nothing to worry about. It normal for them to start turning brown around almost halfway through. She'll probably start spending alot of energy on sugar now and start fattening up.

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