I haven't had time to investigate, but more probably just the appraisal system has changed - so that you need higher IV% to reach "wonder" status.
If this is the case, you needn't worry. All IV's are the same as they were. Just a theory though.
E: nevermind, I checked and the border is still 80% caught my attention and 82,2% is a wonder.
Maybe there's and update I haven't received yet?