hmmm, that is weird... that it is effecting your buds like that.... the leaves look like they are going through some sort of deficiency.. which is normal (more or less) for a flowering plant.. but usually diuring flowering the defciency, will manifest as the leaf turning yelllow and falling off.. not the spots...
The spots can be a couple of things...

K
MG
or PH impbalance?

which do you think it is?

love

I can see why you think it is a burn... that would have been my first guess to, (if I just saw the first picture)!!!!!

: )
love