Adthrive has made the site unusable for me on the iPad using Safari with the AdGuard extension installed. I get the popup that has already been reported by other users and Paul. I have used this “opportunity” to explore some other options that may help other readers.
The easiest option is to use Brave with aggressive blocking turned on instead of Safari. There’s no popup with Brave.
I’ve also had success with switching from the AdGuard Safari extension to the recently released Ublock Origin Lite extension.