By default, Aura is restricted to repricing within your min/max range to ensure all prices are contained where expected and to mitigate pricing-related issues.
If you see instances where any Walmart listings are priced below your set minimum prices, there are two known settings in Walmart Seller Center that can be the root cause.
Walmart Funded Promos
If you see a Walmart listing being priced below a set min price, it may be enrolled in a Walmart Funded Promo.
If this case, Walmart will show your offer at a lower price and subsidize the difference between your original offer and the shown sale price as an incentive.
The incentive amount may vary and is subject to a maximum cap beyond which the item price is restored to your last submitted price with no incentive applied.
Walmart's sale price will override Aura's price changes if any items are enrolled in a Walmart Funded Promo.
If you wish to not participate in these promotions, you can unenroll specific items through the Incentives page or disable your entire catalog from consideration for the Walmart-funded incentives program.
Walmart's Native Repricer
The other known instance where Walmart listings may be shown below their set min prices is when Walmart's built-in repricer is active.
Walmart's native repricer will also override price changes submitted by Aura and will price based on your settings in Seller Center.
You can remove listings from a repricing strategy by following the steps in Walmart's "Repricer: Manage a Strategy" resource.