I can't edit the remarks in my comment above but I can correct it here.
AirBnb phone support helped me out with this.
What was going on in our case was there were some old "Custom Monthly Prices" on the listing
Unfortunately, these are hidden out of view on the Pricing and availability page.
To see them, you first have to click on the Edit link next to Monthly Discount.
Then, beneath the Tip suggestion for the discount in your area, there is a link labeled
Set a custom price for a specific month
Click on that and there are the custom prices.
I must have set these up during Covid when there were not many short term bookings. Probably better to avoid this feature and just use the monthly discount percent (if that!)
Prices have gone up so much in our area that these custom prices were WAY off.
Also, don't forget to click the black SAVE button below after you make the edit. We kept erasing the discount and it would be back again because we didn't see the Save button down on the next screen.
