What could causing my buds to not fill in right they look good until I harvest them then they seem empty or soft hollow like these are clones of california gold I think is what it was called I bought it from ilgm
Welcome to the community!!!
Most likely inadequate lighting
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Welcome to the forum!
I agree in that a lot of times buds can be pretty fluffy from poor light density. Some can be that way and just be genetically a little more airy than others too. Poor environment, feeding, diseases, bugs, and other things could also inhibit flower development too.
Do you have some information about your space and equipment that you could share to help us getter better idea of what you’re looking at?
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Welcome to our community. Sound advice from all, lighting is so important in good grows. Most of us has experienced what you have. happy growing 
