Looks like another javascript is interferring. But which one?
Yes. That’s what I thought when I studied your page. This bug is not in Easy Timer 2.6.3, and not in any version of Easy Timer. It’s a conflict with the nonSecureAnonymousFramework file (probably a file of LinkedIn).
I don’t know which plugin load this file (if this file is loaded by a plugin). Try to remove it or disable the load of this file. If you succeed, your bug will be fixed.