The lines in my texture become distorted,

Hello,

I’m a beginner to Sampler and it’s driving me crazy...

I have a texture created in Photoshop:

• 6 vertical green stripes
• A black gap separates each stripe from the next
• 4096 × 4096 resolution

I import it into Sampler to create a texture from an image.
I reduce both the micro details and large details to the minimum.
I add a Brightness/Contrast layer to the Height map.
I apply a vertical stripe mask that exactly matches my original texture.

At that point, the lines in my texture become distorted, with peaks and depressions appearing. The stripes are no longer perfectly vertical, even though they remain perfectly straight in both my Albedo and Height maps.

Why me ?

Thanks for helping.
Best regards.
GP