You’re seeing an Anubis anti-bot check to keep the site safe from automated...

https://list-wiki.win/index.php/What_is_a_Headless_Browser_and_Why_Do_Sites_Try_to_Detect_It%3F

You’re seeing an Anubis anti-bot check to keep the site safe from automated abuse. It uses a simple Proof-of-Work test in your browser to verify you’re a real person