Problem with growth on one branch

Hi. I have an issue with the vegetation and flowers on only one branch. This is a critical hog F18 in pro-mix HP. I switched from grow to bloom nudes about a week ago and tried some hydroplex. I feel like there might be slight nute burn because I see some rust and curled tips on a few leaves. However one section of the plant is looking a lot lighter and crispier than the rest. At first I thought it might be a pest issue because it was localized in one area but then I looked at the branch supporting this part of the plant and saw this interesting thing.
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I'm starting to think water and nutes are not reaching the top because of this.

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I tried to spray that section with water to see if it perks up. I also taped the stem to see if it helps.
Here's another issue I found there.
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Has anyone ever dealt with this? Things have been pretty smooth up until now. I'm going to flush her a bit to see if I can arrest any nute issues, but not sure what to do with that section.
More images in case they help
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Thanks
 
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