Buds turning brown starting from bottom

This is my second post as I could not upload photos to the last one. Hope this one works.

Hello, I hope someone can help me. I have several outdoor plants that have been growing and are starting to flower. I noticed that the buds are turning brown. I know what bud rot looks like and don’t think this is it but not sure. Recently I gave my plants a heavy dose of Maxsea to give them extra phosphorous and potassium. I have some plants that are not doing this and are of the same strain. There are some very small black bugs on some of the leaves but not very many.

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