It's not a real user agent string, most browsers have the Mozilla part. Anyway, I changed my user agent
and so far it's not happening again, but it's not been too long.
Also, in the past most of the time i didn't have any problem with these links, it seems like it just
redirected back to the real thing, but i'm not sure.

Well, he said "Mozilla/5.0 (compatible;)". EVERY web browser says they're "Mozilla/x.0 (compatible;)". Even most things that aren't actually web browsers say that. They're just usually more specific than that (i.e. they also say what they really are, and what the OS is, sometimes other useful information).

I'm just trying to narrow down what is different about the setups of those that have the problem and those that don't.

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KGS 4 kyu - Game Archive - Keyboard Otaku