Retweet Count Difference from Retweets?



I’ve got a confusing issue with the API…

Calling statuses/show/:id on a tweet shows a “retweet_count” of 61.
Calling statuses/retweets/:id on the same post shows a count of 48.
The website, when clicking the “retweet_count” shows 48 also.

Is there a reason for the difference, or am I just missing something?