Is there any laws around this having to be accurate? What makes you say it's higher than the bottle says? I know nothing about this, so mainly just curious for you to expand more on your comment.
High alcohol wines are somewhat in favor for Napa/Sonoma reds, but 14% is a cutoff for lower excise tax rates and a lesser regulatory burden in general, so it wouldn't be surprising if people are trying to game this somewhat.
A funny thing about wine industry regulation is it's entirely focused on whether or not you are paying taxes. We've never had to file or demonstrate anything related to the safety or purity of our wine.
[1] https://www.washingtonpost.com/news/wonk/wp/2016/01/06/how-w...