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Height Map for Text

Hi, I´m working on a professional project and need to make a 3D text, so I tried to create this using heightmap(both Tesselation and POM).
Almost everything is the way that it should be and I´m glad with the result, except some wierd lines on the volume. I really need help with this. Am I doing something wrong ??

https://www.youtube.com/watch?v=rX_kKltAQJE