Parts are flashing

My parking spaces are flashing like in the video below
robloxapp-20220413-2124224.wmv
(Idk how to make it appear in this post)

I dont see any flashing in the video but raise the white line parts ever so slightly and it should make flashing go away…flashing effect comes from two evenly placed parts that overlap perfectly.

See this link…

https://devforum.roblox.com/t/problem-with-textures-overlapping/1742638?u=rmofsbi