I just checked it again and it passed all tests on current chrome. You may need to try a different browser, try your browser’s private mode, or turn off any browser extensions. Usually these problems can be debugged but without an error it’s a lot harder to find a problem.
Still passing for me. The tests run in your browser and do some basic DOM inspection to check the project, so the next check would be any customizations (light/dark mode, etc.) or extensions you might be running which may have some effect. Or if possible, try a different computer.