Multiple Captcha Challenges For Overseas Visitors

We have rules in place for our sites to challenge visitors to our site that are not in the US. Some of those visitors are reporting that when they are challenged they are required to complete multiple captchas before they get to our site. Has anyone else heard of something like this? Are there some countries whose challenges are more rigorous than others?

Just to clarify, does it give them multiple puzzles to solve or, once one is solved, it starts again?

They are reporting it starts again.

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