I had a similar problem and after I called 415-800-5959 (their emergency line, but you can also select "not an emergency" option twice to get to standard customer service) and waited a LONG time on hold, they were able to help me fix for ours.
We had smart pricing turned on, and here are the steps we took:
1. Turn off smart pricing.
2. Set nightly/weekend rates to the same minimum as smart pricing.
3. Log out and log back in to be sure it saved.
4. Turn on smart pricing again, but set the highest/lowest pricing within about $100-$150 of each other.
5. Log out and log in to confirm save.
After step 3, you should see the reduced pricing reflect on your listing, and keeping the highest/lowest price range more moderate will make it less likely that your listing will have a price spike without really good cause.
Ching, my tech, also said they could track specific instances where a certain rate was quoted but a smaller/different amount was paid - you just need to be able to help them access that specific reservation. This is a US number based in San Francisco.