issue caused by height probably is making my character green

Hello, I did the textures for this character and then I sculpted simple details to the lips, and after rendering I wanted to re do the texture just to get the hang of the software so I exported the mesh again and added a fill layer and suddenly the character turned green, I couldn't add color, none of the sliders work only the height slider changes it from green to yellow and that's it.

If you have a fix for this problem or have any idea of what would have caused  this please let me know.

Here is a picture of the problem that I have at hand :

 * I am a bit of a beginner in this software, and to texturing in general.