Featured Offer Question

Hello! I am the sole seller of a product that I designed, had manufactured, and sell on Amazon FBM.

I noticed that my “Featured Offer %” box has fallen from 83% 30 days ago to 54% now. I don’t really understand this feature and how I can be anything less than 100% when I am the only seller of my product.

Regardless, when I go to “Pricing Opportunities” on the pricing health page (which is where Amazon links me from the notification about my falling Featured Offer %), it says that two color variations of my product are “Not eligible to be the Featured Offer due to significantly high price.”

Next to that, it says that my product, which is listed for $70 on Amazon, has an “Average selling price” of $78.03. I’m assuming this must include shipping. If there are no other sellers of my product, how can Amazon deem my product as having “significantly high price”?