Only a few buds loose pistils

I’m not concerned but curious as to why only a few bud points are either bald or whithered when the others are fine. These buds are at different depths from the canopy.

Some potential causes; had a ph meter malfunction and has some very low ph for one day. Decided the blast the fuck out of them with a side light when the one above is plenty. The fan is too close?

I think the plant is fine and it’s a practice plant anyways/first grow but I’m curious. F24

Thanks