Problem with specific website

Hi, I am new to the support community. I have a MacBook Pro (Mid 2012), run OS 10.13.3, Firefox 59.0, and Safari 11.0.3. The problem occurs in both Firefox and Safari.

My wife has a Wordpress website (managed by someone else) and one photo on her website loads upside down. The manager had problems getting the photo configured properly, and my wife viewed the website with the improperly loaded photos. The website has since been corrected. The website reads correctly when view on the manager's computer, my iphone, my wife's iphone, and my Nexus tablet on Chrome, but not on my computer with either browser. I have tried clearing cookies, history, and caches on both browsers. I have cleared evercookies. I have connected directly to ethernet. I have restarted the computer. I have emailed myself a link to a correctly formatted website from another of my devices and then followed that link. All with no success.

The website manager has suggested that I have a cache for the old, incorrect website, but I am stuck. Any suggestions?

Thanks, JCJaaanson