My house gained $100k after I bought the house and Zillow realized it was renovated. A few other house have sold (including Zillow buying one) in my neighborhoo

My house gained $100k after I bought the house and Zillow realized it was renovated. A few other house have sold (including Zillow buying one) in my neighborhood and my house is on the high side of the average price. It makes me wonder why the estimate gained $100k in 60 days. Once Zillow bought a house of course everything went up.