malware?

Apparently I have some kind of malware on my site.

https://www.cchca.org

Clicking on the group picture in the center (“cchca board”) sometimes causes a pop-up to appear that says “There is a new Flash Player version. Install new version for better performance.” It seems to only happens the first time – the next time I click the picture, then it works normally.

I have WordFence, Securi, Limited Logs, and several other security plugins installed. i ran a scan on the Securi website; it found nothing. I also ran a scan with AntiVirus plugin, found nothing. And of course I ran WordFence and it said:

“Congratulations! No security problems were detected by Wordfence.”

any thoughts?

thanks