My 3D objects colour keeps turning green when I change it to yellow, how do I fix this?

[Tsz Hin5EE0]

This is my first time using the 3D tool in photoshop and I'm following this tutorial: 

https://www.youtube.com/watch?v=oJgeCeyLx04 

I'm running in to problems at 9:48, where he changes the colour to yellow. On my photoshop the colour of the render keeps turning green instead of yellow and I can't figure out anyway to change.

Someone plz help, I need this for work D:

I've provided images of my lighting and colour settings etc.

Thanks!