You could try a few more tests.
–When you disabled the plugins you also disabled the caching plugin right? While the plugins are disabled clear your browser cache then check.
–You could also try to temporarily disable your text widget on the sidebar then check.
–Temporarily remove your footer text and check. You’re using the <font> tag. This could be rewritten in a better way.
I’m seeing extra </a> tags on the footer text. That could be it.