This has happened for me on regular residential Internet access.
(Check the box, and get redirected to check the box again.)
(Check the box, and get redirected to check the box again.)
I'm using a fairly mainstream ISP in a fairly mainstream country.
I don't get why I seem to have such a hard time. I've kept the same IP for months.
But the worst thing overall is that it just doesn't acknowledge it.
Want to block me? OK. But tell me that! Don't just make me tick a box again and again and untick it. It's infuriating.