Tagging wrong title

I am new to this but had the program working correcly at first, then all of a sudden when i pick the correct song title from the list it will show up as the wrong title in the program, it usually shows up as the first song/track from the list given even though i have chosen something different.....
any help appreciated

You have to be a little more specific.
What "program" does not behave as it should? What "list"? Do you refer to the tag-sources?
Do you refer to the tags or the filename?
Have you got APE-tags in your files? If so, get rid of them.

This is only to show you that there are many possibilities for undisred behaviour.