So, I was watching items in the marketplace and put them in my watch list... But, even though I am watching them, they don't show up on the list on the main marketplace page. I'm confused as to why it isn't showing on the list. Am I missing a step or it bugging out on me or something?

Items will only show up on your watchlist if there are any actually for sale. For example, if you're only watching one item, unless someone is selling that item, your watchlist will show up as empty.

Oh, okay, I was just really confused about that.

That's fair. I've been on this site longer than the marketplace and I still get confused by it at times.