Table of Discontents

I am formatting my Table of Contents, my List of Tables, and my acknowledgments for my thesis, when I realize that I have some of my tables lettered with uppercase: This Table is for Cool Numbers; and then some with lowercase: This table is for cool numbers.

And right now, for the life of me, I don't know which one is right or if I want to use one over the other.

How did I do that in the first place?!