Parent ASIN not working

Hi,

I’m experiencing issues with my Amazon listing. I’ve contacted support, went through the help pages, .. no success. I’m looking for help from you guys as a last resort.

I have 1 product on Amazon available in 4 colours. I assumed everything was set up correctly as there is 1 shared product page that offers the option to select a colour, but for some reason 3 colours SHARE the information while one doesn’t.

And for some reason Amazon shows the outlier variant most often in the search results.

What is the best & quickest way to solve this issue?
Thx!