In an indoor setup its quite normal to have different matured budsites. Its a question where the light can reach to. The light helps to maturate the buds, the more light reaches the faster they maturate. because of this grower do training on the flowers , do mainlining, or SCROG. If you use a SCROG nearly all budsites mature at the same time. Or having an even canopy in attempting LSt or HST gives you even matured buds too.
You dont have to do anything now to change it in you previous grow. In " worst" case you just have to harvest in stages.
Happy growing