Logged into your site at 5:32pm. Logged out of your site at 5:58pm.
I installed the most current version of BPS Pro and added some BPS Pro Bonus Custom Code.
Your Plugin Firewall needed some additional whitelist rules so I added those.
I scanned your site with the BPS Pro Pro-Tools DB String Finder and String Finder tools – no malicious code was found.
I manually checked all .htaccess files – no malicious code was found.
The only other logical explanations are that either this is a drive-by thing, the redirects are loading from one of the many 3rd party links that you have loading on your website or the redirect is occurring at the CDN or Cloud level.
You should setup the new JTC Anti-Spam/Anti-Hacker security feature that was added in the more current version of BPS Pro that I upgraded you to: 8.3 on your site. 9.0 comes out in the next couple of days.