Try the possible settings of the Tools->Configuration Files->filetypes.common->folding_style
setting.
I suspect that the vertical line from a higher level fold combines with the end corner for a nested fold. "Somebody" would have to find the code that sets the vertical line and (optionally) not write it on lines that are the end of a nested fold. The code may not be in Geany it may be in the Scintilla or Lexilla projects Geany uses, this is left as an exercise for the reader.
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