Somehow a "Budget 2" has appeared in my file. As far as I can tell, it contained the same information as "Budget" when it spontaneously created itself

but when I update a cell in "Budget", "Budget 2" does not change. Will this effect my overview? And how can I get rid of it? I am concerned that I will mistakenly update "Budget 2" instead of "Budget" and get completely messed up. I am on a Mac using Open Office. Thanks-