Have you reviewed information you found early in your research? Perhaps you entered data without really analyzing it or copied only parts of a document or a book without realizing that there was more?
Are there any conclusions you reached early in your research that you are "sticking" to, even though you should go back and analyze them now that you know more?
I have copies of court records in my files, where I now realize that I only copied part of the record, what I thought was important when I was first starting my research. Now I realize that there might be more.
If you have not done it, it may be worth your time to revisit some things you "discovered" when you first started.