Title tag has random strings injected on certain posts

On certain posts that have non-alphanumeric characters in the post title, we are having random strings that look like debugging statements injected into the page metadata – title tag – that then shows up in Google Analytics.

The strings look like <!--string(1) "0" --><!--string(1) "1" --> and show up with no rhyme or reason on certain articles. But the number of these strings always matches the number of non-alphanumeric characters in the headline (comma, apostrophe, etc.).

Spent many hours trying to debug this and fish through the plugin code. Please feel free to contact me directly if there’s anything I can do on my end to help identify the problem.

The page I need help with: [log in to see the link]