Check for your images, found one of mine.

https://www.bigstockphoto.com/search/?contributor=isstrip

SS thread on this also:

http://forums.submit.shutterstock.com/topic/90198-help-and-advice-needed-one-of-my-image-i-selling-by-other-contributor-on-bigstockcom/

Just got this from ShutterStock:

Dear xxxx,

Last week, we had a display issue that affected your Contributor Dashboard. The issue caused your earnings for each download during a 12-hour time period to be doubled. That 12 hour period was from 9:45pm Eastern Time on Thursday, August 11th to 10:30am Eastern Time on Friday, August 12th.

We have fixed the issue, and, in the next day or so, you will see your earnings for August corrected. The correct amount you earned for August 11th and 12th during that 12-hour period is: $x.xx.

As you know, we are investing heavily in upgrading the technology that powers Shutterstock�s infrastructure, website, and mobile apps, to deliver improved functionality and a better overall user experience.

Thank you for your understanding.

Shutterstock Contributor Support Team