All my textures show up really dark on Landscape?

Hi, I have a landscape with 9 different textures, but they all show up really dark when I paint them. Here’s a screenshot:


They all show up really dark in the paint tool as well:


Here is a screenshot of the blueprint. Only one of them has a height (I was testing to see if it fixed this problem, it didn’t) and only 3 of the textures have normals but all of them are dark, including the ones with normals.


I’m not sure what to do make them come up normally, please help!