This is what I'm trying to achieve:
I've already created a seamless tile that is 4"x4".
From that tile I'm trying to create a square of 20"x20" that's also seamless in Xara.

So the final image will be a seamless 20"x20" square.

Squares with edges that don't have exact matches is what I'm getting now when I resize the tiles inside the large square.

The 20"x20" size is just an example, It can have different sizes (10x10, 30x30, etc).

Any suggestion is welcome!