You seem to be using chrome.
check your page using the web inspector:
https://developers.google.com/web/tools/chrome-devtools/
You can even hit Cmd-F to bring up a ‘Find’ box and search for all instances of your class. You will probably find multiple instances of your class in the source.
If you only want to print a single element, look for the ID, as there should be a unique ID for the same wrapping element as your target class. Target an ID like so:
[print-me target="#some_unique_id"/]
We would like to assist you further, but this is the limitation of free support offered here on the WordPress forums. If you require personalized support, you might look into upgrading to Print-Pro-Matic, as it comes with a high level of personal support.
All the best!