You cannot update the data.
Although it is unsettling to see the wrong information and subsequent value associated with your home, trust me when I tell you - the values are not real - and never were "real" to begin with.
When you sell your home your real estate professional will provide an estimate of market value to you based upon accurate data, fact-finding to the absolute truth! Just as you know the information is wrong, so will the buyer of your home.
Between now and then, your home could become a garage apartment or morph into a mansion. Check back again when you want a chuckle.
In the meantime, don't worry!