Block content images

Hello Rt Community!!

Any suggestions on how to fix this!

Mixed Content: The page at ‘https://www.domain.com/sitewide-activity/’ was loaded over HTTPS, but requested an insecure XMLHttpRequest endpoint '‘http://www.domain.com/wp-content/uploads/rtMedia/users/17/2015/05/image.jpg’. This request has been blocked; the content must be served over HTTPS

This message will comes up once i press the load more!

on media folder, theres no problem… Thanks in advance!