I tried Maxthon Portable right now 5.2.2.5000 without an account or any extension and it is the same. I have the same problem at home and work on different networks. At home, I'm testing NextDNS service and it is blocking validate.perfdrive.com sp the error from the picture. At work no filtering, then it goes to another verification page, and then to njuskalo.hr.
Edge, Chrome, and Firefox do not have that problem, not at home or at work on the same PCs. They go straight to result page.
I see using inspect on Firefox that it blocks validate.perfdrive.com yet it loads the page. Chrome does the same. Maxthon redirects if allowed, or stops if not.
Also, main page does load, but when searching for an article or accessing via direct link, then it does not work
Maybe old Cromium core is the issue?