revision after revision after revision

I need some advice. Went under contract on a home that I was flipping before I even listed it. The buyer's appraisal came in about $15,000 below the contract price; however, it had significant errors, and the appraiser did not appear to be competent with the area. I'm working with my buyers on a...

Can anyone offer their personal history with this scenario (or something similar): I completed a standard appraisal report for an AMC. Submitted and it was approved. A week later they emailed stating a revision was required suggesting I remove the value of a boat slip that goes with the...