Blocky textures when importing height maps from World Machine

Hello, I am having an issue with my landscape material where the textures are blocky when applied using heightmaps for each layer. If I hand paint the landscape it looks fine, but I can’t get those realistic results I want that WM is capable of.

https://imgur.com/bynEfcx
https://imgur.com/pddyOrO

As you can see the blocky textures are still faded around the edges, making it less noticeable. As you get farther away it starts looking spotty to me. Below is a picture of my material nodes. As you can see it is a fairly simple one as I am completely new to the material making process.

https://imgur.com/EW3LRJk

If you need any additional information I will be more than happy to provide.