The light colored paints are thick and lumpy

I'm enjoying painting this rooster but I'm noticing that the light colored paints are thick and lumpy. These light shades are very difficult to use. It's strange but it consistently the light colors. The dark colors are great. Can I get replacement paints? If youd like me to buy, let me know how. I'm about 1/3 done and would hate to throw out the project.

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