Help! My plant stalk is green on the top tiny brown in middle and green down. HELP!

She looks good but i noticed today that she has a brown spot going around her stalk. There is a good 3 inches of green on the top about 8 cm of brown in the middle all the way around and she wobbles because of it and 3 inches of green after the brown spot. Please help me i have 24 plants in my bubbleponics system and they are going strong. The roots look good on the one with a problem i just want to know how to solve this.

Thank you

As long as she is looking good, I wouldn't worry about it man. Could just be part of that strands gen. It will most likely grow out of it

Well its white widdow from greenhouse, my friend is a big time marijuana grower and he said it has a disease starting with a B or an M i just cant get a hold of him. shes wobbly and i have to have 4 supports on her.