Reply To: Why am I splitting at the seems?

[Martin Bergwerf]

It is a known Limitation of EEVEE. If you set the Object to Shade Smooth, the Displacement will work correctly:

https://docs.blender.org/manual/en/dev/render/eevee/limitations/limitations.html#shader-nodes 

Let us know, if you got any more trouble with mixing the Textures.