An actual URL of the site would really help...

Your K2 template overrides have unclosed </div> tags. That's why the layout breaks. See how it looks on Protostar (hint: just fine): funnystash.com/?template=protostar

I've no idea what's going on with your template, really.

Seems OK now.

In which case I can only guess some plugin or module that is not always loaded is breaking your HTML.

If you spot an issue again, use this to see where your HTML breaks: validator.w3.org/nu/?doc=http%3A%2F%2Ffunnystash.com%2F

Perhaps there's an update for that module. :)

In any case, it's not a K2 issue.

You're dealing with Joomla issues (and not K2 specific issues) which are beyond the scope of this support forum.

You can try asking in the main Joomla forum.

If you don't wish to touch any code, perhaps Joomla is not a good fit for you.