errors i easyblog

I'm testing easyblog on the development site http://www.wallcities.com and I get 2 errors:

1) Mixed Content: The page at 'https://www.wallcities.com/en/blog/authors/mercatino' was loaded over HTTPS, but requested an insecure script 'http://cdn.stumble-upon.com/ js / badge_su.js? v = 20120613 '. This request has been blocked; the content must be served over HTTPS.

2) Mixed Content: The page at 'https://www.wallcities.com/en/blog/authors/mercatino' was loaded over HTTPS, but requested an insecure stylesheet 'http://cdn.stumble-upon.com/ css / badges_su.css? v = 20120613 '. This request has been blocked; the content must be served over HTTPS.

do you know what it is and why?

thank you
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