How do I fix problem with landscape layers being stuck transparent?

Hey I’m working on an environment and I’ve run into an issue with landscape layers. The problem is when I try to paint the layer it shows up but its transparent and nothing affects it. If I try to paint over it the new layer just appears beneath the problem layer. This has happened many times when I add a new layer on a material and I’ve been trying to find a good answer that works for a long time.

At first look it may appear fine but the tiles are 50% transparent, I’ve got no idea what I did wrong.

This is my node set up here.
Thanks for any help in advance.