Color changes due to onion skin photoshop animation

hello,

I'm trying to draw and make an animation in Photoshop, so I turned on onion skin but now my color changes when drawing, I'll show you in the pictures.

in the first picture you can see the actual color (this is when I dont let go of the mouse button so I still can draw) and left corner you can see its the actual color. but when I let go of the mouse it turns into a darker red color instead of orange. How do I fix this?