Help! Small brown spots only in the stem during drying

Hi guys, I cut about three days ago and right now the girls are in the room drying at 62 degrees and 58/60% humidity. Inspecting in the middle of the flowers I noticed that in the center of a few flowers ,precisely in the stem, there are marks that tend on the brownish. Nothing like that on the flower, it looks healthy.
I inspected everything and there is absolutely no mold and it does not seem to be getting worse, I noticed that they are very small patches that look almost like bruises.
Can anyone clarify this for me? The plants were a bit tossed around during cutting since they were in the netting and I wanted to opt to dry the whole plant and they bent as I handled them... but I'm just making assumptions
 
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