Shareaholic Share Buttons rely on Pinterest API's to officially report counts. As we do for other social networks as well.
Randomly, every now and then Pinterest API fails to return an accurate count. This is a known bug with Pinterest’s API and nothing to do with Shareaholic. In fact, Shareaholic uses the same API's that the official Pinterest Buttons use. We know, it is frustrating, for us included.
Pinterest says that they are working on the issue. But it's been a while, and the API remains flakey.
What you can do:
We recommend reaching out to Pinterest support with 2-3 examples of URLs that you believe the pin count to be inaccurate with corresponding Pin URLs that have share counts. They can sometimes manually correct the count on their end in their backend.