A guest editor is having an interesting experience when viewing reviews. In Firefox they don’t appear, so he tried Safari and they did. Next time he went in he tried Safari, they disappeared completely, so he tried Chrome, still couldn’t see them.
Please note that the version of OJS that you’re using is no longer supported by PKP. I recommend that you upgrade to the newest version of OJS, as it is possible that your issue will be resolved by upgrading. However, other community members may wish to offer assistance.