Every now and then, a social network API fails to return an accurate count– Pinterest is one of the most infamous for this problem.
This is actually a known bug with Pinterest’s API and has nothing to do with Social Warfare. We’ve talked with their development team on several occasions, and they’re well aware that the flaw is on their end. You will find the same result with any sharing system which is using Pinterest’s API (we’ve tried).
You can Contact Pinterest Support here if you have issues.
If you ask them nicely and provide a URL with the pin count you believe to be inaccurate, they will make the occasional exception to manually correct it within their API. We can’t make any promises for them, though it’s certainly worth asking.