Slight Graphical Error

[ReddRumn]

Was testing a WAD I'm working on and noticed that a texture is weirdly showing through another. I've attached an image that shows the problem.
TOP: GZDoom Builder
BOTTOM: Zandorum 3.0

 

Is this an issue I can fix, or something with Zandorum?
Thanks for any help.

[scifista42]

Make at least 1 unit height difference between floor heights on each side of the line, or at least 1 unit brightness difference between sectors on each side of the line, or use "Clip middle texture" flag on the line if you're mapping in Hexen format or UDMF.

Edited September 25, 2017 by scifista42