How do I reverse the Zillow value update? Now my home account differs from the register balance.

When I received the reminder to check my homes values at Zillow, I selected the option on the pop-up screen to have the Zillow value estimates recorded to my two Homes accounts. Neither updae was correct (both did not use the estimated net proceeds, but the gross sale values; one of the two entered an amount that did not equal any amounts displayed on the Zillow web site.)
Now my account summary amounts are frozen and do not relate to the accounts' detail registers balances.