09/26/2025
When two sellers offer the same product at MAP pricing with excellent metrics, the Amazon Buy Box typically splits orders between them, but sometimes the rotation stops and one seller gets all orders. This is a known issue and is not always caused by violating any rules—Amazon’s algorithm weighs several factors beyond price and profile metrics, and may suddenly favor one seller exclusively due to subtle differences or recent changes[1][2][3][4].
Why the Buy Box Rotates Unevenly
Amazon’s algorithm considers multiple factors in addition to price and metrics:
- Inventory distribution and stock levels: If one seller’s FBA inventory is better distributed across fulfillment centers, that seller will likely be favored in certain zip codes[1][5].
- Sales velocity/history: The algorithm often rewards sellers with higher recent sales volumes or longer sales history, even if all other metrics are equal[6][1].
- Seller “Authority”: Older, more established sellers may get preferred due to longevity or cumulative transaction counts[6][1].
- Frequent algorithm updates: Amazon periodically changes how Buy Box rotation works, causing temporary or unexpected shifts in allocation[7][2].
- Inventory levels: If stock is low or unevenly distributed, it can reduce Buy Box eligibility even if shown as “in stock”[5][1].
What You Can Do
- Check and replenish inventory: Make sure your FBA inventory is healthy and well-distributed as this impacts national coverage and Buy Box share[1][5][8].
- Run PPC campaigns or boost sales: Temporarily increasing your sales via paid campaigns can sometimes trigger the algorithm to recognize you again for Buy Box rotation[1].
- Open a Seller Support case: While responses are often generic, documenting the issue and requesting a manual review can sometimes help if the algorithm malfunctioned[1][2].
- Monitor competitor inventory: Sometimes the other seller may be undercutting MAP on shipping options or other subtle details, so review their offer and fulfillment specifics closely[9].
- Consider price rules: Even if MAP is enforced, investigate if there is any leeway in shipping speed, quantity, or bundled offers that complies with MAP but distinguishes your listing[10][11].
- Test delivery zip codes: Search for your listing as if shipping to various regions to see if you get the Buy Box elsewhere. This could reveal regional bias that can be corrected by redistributing inventory[1].
Key Points to Remember
- Buy Box rotation is algorithmic and not guaranteed; Amazon is not obliged to split evenly between equally qualified sellers[2][3].
- Document your metrics, inventory, and correspondence with Amazon if you want to escalate or dispute allocation issues[2].
- Long-term advantages may go to sellers who continuously invest in broader inventory, faster fulfillment, and consistently high metrics, so make small adjustments to test what works[1][7].
If this issue persists, and none of the above strategies help, it may be due to an internal algorithm shift or an unknown preference that only Amazon’s system can resolve in future updates[2][7][3].
Sources
[1] Buybox Not Rotating - Amazon Seller Central Buybox Not Rotating
[2] Buy Box Rotation broken - Amazon Seller Central Buy Box Rotation broken
[3] buy box not rotating - Amazon Seller Central buy box not rotating
[4] BUYBOX NOT ROTATING AT ALL - Amazon Seller Central Singapore BUYBOX NOT ROTATING AT ALL
[5] How to Win the Buy Box & Not Lose It as a New Amazon Seller https://www.youtube.com/watch?v=AEMaKEkflSM
[6] Understanding Buy Box Algorithm (MAP prices & FBA sellers) Understanding Buy Box Algorithm (MAP prices & FBA sellers)
[7] Has Amazon Tweaked its Algorithm? - Seller Snap https://sellersnap.io/amazon-buy-box-rotation-change/
[8] How to Get the Buy Box on Amazon - Secrets Sellers Should Know How to Get the Buy Box on Amazon - Secrets Sellers Should Know
[9] Amazon Buy Box Issues & How To Fix Them [GUIDE] Amazon Buy Box Issues & How To Fix Them [GUIDE]
[10] Amazon Buy Box: How to Win in 2024 (Step-by-Step Guide) https://www.junglescout.com/resources/articles/amazon-buy-box/
[11] Amazon’s Buy Box: Why It’s Important to a Sellers Success Amazon’s Buy Box: Why It’s Important to a Sellers Success - Marketplace Velocity
[12] 7% Buy Box - Two Sellers - Both FBA - Same Price 7% Buy Box - Two Sellers - Both FBA - Same Price
[13] How to win buy box with MAP pricing - Amazon Seller Central How to win buy box with MAP pricing
[14] Uneven buy box rotation? : r/AmazonSeller - Reddit https://www.reddit.com/r/AmazonSeller/comments/18o1zxj/uneven_buy_box_rotation/
[15] Overcoming Amazon Buy Box Suppression - MAP Policy Partners Overcoming Amazon Buy Box Suppression - MAP Policy Partners
[16] BuyBox NOT Rotating on 90% of listings BuyBox NOT Rotating on 90% of listings
[17] How to Win the Amazon Buy Box in 2025 - CedCommerce https://cedcommerce.com/blog/how-to-win-the-amazon-buy-box-in-2025/
[18] What Is the Amazon Buy Box? - Helium 10 What Is the Amazon Buy Box? | Helium 10
[19] Stop Losing Sales: Introducing the Buy Box Map for Amazon Sellers Stop Losing Sales: Introducing the Buy Box Map for Amazon Sellers
[20] Amazon Buy Box: What Is It & How Does It Work? The Complete Guide Amazon Buy Box Guide: What It Is & How It Works
