Color bubbles/dots on amazon search page

Hello, would somebody know how or the reason why the color bubbles/dots under our product listing on amazon search pages show same color tones/pallets? Our product consist of variation colors like red, blue and green etc. but when you see the listing on search page, it just show same color "brown" tones/pallets. There's also an uploaded swatch images for the child listing and everything seems normal in product detail page. I see some listings that shows color color bubbles/dots and I'm trying to figure out how they are doing this.

Thanks and hoping somebody could be insights.