buds turning yellow

I harvested most of this plant a few days ago but left a few branches that looked not so done. I went out today and a few buds are starting to turn yellow? It's hard to get a good pic but its patchy yellowing

More info on your grow would help,

but from here, so far all is OK

as I suspect a little photo burn,

or lack of light, until more info ....comes to lite ...lol