Yes, some title have slightly different names. We are working on unifying all the names and titles.
You should be able to right click on a tab and select "Title File Location" and find where it is. If you have done that and the duplicate still appears, that is because of a nasty trick Microsoft plays with files. Often Windows makes copies of files in the Users folder and actually uses them instead.
They are in a hidden folder usually the Users/USERNAME/Appdata/ folder. Try searching your Users folder for a file name.
Developer, Bible Analyzer
But to him that worketh not, but believeth on him that justifieth the ungodly, his faith is counted for righteousness. (Rom 4:5 AV)