First, make sure you're using the latest available version of Firefox, Chrome, Safari, Opera or Internet Explorer. This excludes betas and so-called nightly builds that might have bugs.
Secondly, please try disabling your installed addons/plugins, if any, to check if they interfere with the correct display of the website.
Lastly, if the above doesn't help, please check if the issue also occurs on a different, freshly installed browser.
If the problem persists, please contact us directly so we can investigate the issue. Please include as many details as possible about your browser, system and the problems you encountered. Screenshots are very welcome.