Maybe my computer is the one being fishy.

I knew there was an old forum post about people's favorite baseball teams.
So I went to the forum search page, and entered "Baseball"
It didn't return the post that I knew existed.
So I jumped around and tested a couple other words in the search, when I entered "MLB" it returned the second highest return was the post I was asking for, which was titled "Favorite Baseball Team"

Am I doing something wrong or is this just a random quirk of the Google Search function?
At first I thought that maybe the search only works on the contents of the forum post, not the title, but I see that the post itself contains the word "Baseball" in the post twice (before I added my reply), so that can't be it.

I didn't see it either in the wargear search, but when I searched google directly:

"baseball site:wargear.net"  it shows up.

I wonder if it's time based somehow.

You're right, it does seem like a quirk of Google site search. I need to create a custom search to get around it it seems.