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Hi Anthony,
That’s a bit of an odd post… you’re expected to replace the instructions with the actual information it ask for… 
Do those walls taper towards the top very slightly? The width change could then be where the line width threshold allows for a thinner wall to be possible. If that’s the case and you’re using Classic wall generator, try Arachne.
That’s my only guess w/out more details.
-Max
My bad. I was in a bit of a rush, so I actually designed this model myself and I had it to be a constant width. I did notice the change happens at this point, right when the small bridge happens.