Terrain Layerblended materials. Meeting textures blend incorrectly. No idea why.

Well I have a terrain and a material created and thought everything was fine until I noticed this.

No idea why it is happening but I can only assume it is related to height layer blending which I need. I cannot work out how to fix this. I have tried adjusting height maps for all the textures and cannot get rid of this.

Any advice would be great.

If there are any more images that would help I will do what I can.

I have made most of the textures and maps myself and the textures never quite seem to blend how I imagine but then these weird texture bleeding issues occur as well.

One quick thing to try - FILL your entire landscape with one of the materials first, and then start painting. I’ve seen this type of weird behaviour when I didn’t…