“Undefined” added to page content after google Adwords click

I have found a semi-solution for this issue. This is the first time i’ve ever seen this issue. No other resources have been posted with the same problem, and google was absolutely no assistance.

After disabling all plugins, changing themes and changing text content their was no change. I noticed that the problem only propagated after the /?gclid=xxx parameter was attached which is the auto tracking parameter from google adwords. My temporary solution was to disable the auto-tagging on google adwords which removes the tagging parameter. This returned the site to it’s original status.

I’m going to continue my investigation on why auto-tagging caused this issue. But i wanted to post my solution here for anyone that comes across this apparently rare issue.