Second odd issue relating to out-of-date files

I was recently working on a code file, and kept seeing a particular echo statement printed twice, when it should have only been printed once. Furthermore, one of the locations referenced did not reflect the current location in the script. Furthermore, there were issues being caused later on in the script, seemingly attempting to call methods on the debug message (and failing, because a string doesn't have getPositionX()). So, I changed the text of that echo message. In the debug log, the incorrect listing stayed incorrect, but the correct one did. I removed the statement, and the correct message disappeared from the log. I changed the name of the function, and it worked as intended. It seemed like for some reason, an older version of the script was being merged with the newer version at run-time. Is this a possibility? If not, does anyone have an idea as to why it could have happened? I had a seemingly similar issue with image files a few days ago, where the new resolution of an image wasn't being seen by the editor. Is there something about TGB's caching that I should be aware of? Thanks!