In a sale situation and considering the price range the difference between $215 and $250 is sizable.
It’s as if the buyer had no clue when they made their offer. Either that or maybe the appraiser really is being overly limited in their analysis. The first question I’d ask is if the appraiser actually went inside the home, because there are some lenders right now who are using exterior-only appraisals, even for sales transactions. Some lenders are even using automated valuations (like Zillow) for certain borrowers and certain properties.
For an appraiser, being too low is only slightly better than being too high. Considering what’s at stake here, it wouldn’t hurt to get a second opinion.