Some Users Getting Porn Pop Ups

We recently moved our church website from Joomla to WordPress. In the last few weeks, we have had several users report getting porn pop ups when clicking through various sections of the website.

I have gone through our site in multiple browsers and have not been able to replicate the problem at all. I worked with our host (Bluehost) to remove and re-add SSL to the site. Their support folks do not get any popups anywhere on the site either.

How can I narrow down whether the problem is with our WordPress site or whether it is an issue on the various users’ computers?

The page I need help with: [log in to see the link]