Clearnet does not allow trading afaik, its only for demonstration purposes
Discussion
Also you probably need to set safety level of Tor Browser on Standard (lowest), as the other ones block the necessary JavaScript stuff
my guess is that's the problem, and why vanilla brave runs it nicely, you have to disable javascript manually in brave, and you can do it but it breaks everything except most darkweb sites
brave has a tor client built into it, as well as extensive antifingerprinting/tracking protections
i didn't even know robosats had a clearnet site...