Issues with cosmetic thread

I am creating two cosmetic threads, both utilizing the creation of two planes on the outside edges at the start of chamfers for each section [ see images 1&2].

The first cosmetic thread is created with no problem [image 3]. The second [mage 4] has an extended section that spans out at the end of the thread and I cannot figure out why this is. Both were created the exact same way and only the second thread is showing this issue. I usually have to do a work-around to solve these minor issues, but I would rather get an answer. Does anyone have experience with this?

Any help would be appreciated.