How to control scale of a geometry map for material?

I created a custom material and used one of the pattern cells as a geometry map. The problem is when I create a clip volume this pattern is not displayed in 1:1 ratio, like Y scale is different to X scale. On the picture below the red wall is generated from the material, the white wall is placed manually with Pattern Area tool. In both cases the pattern comes from the same cell. As you can see the red bricks are about 30% shorter than the white ones but their height is the same. How do I make them to look exactly the same? I played a bit with material properties but could not find a setting that affects the geometry map scale.

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