Vertex paint same color palette but become white on model

Hi i’m new to vertex paint in blender so i don’t know if i press a wrong hotkey or something without realize it. But, when i try to color my model using vertex paint with the same color it become white like this:

any idea what wrong with it?I can upload the file to if you want. Thank you very much (^^)

Post the blend file. I cannot reproduce this error, and my render is showing the vertex paint as it is.