Here's a thing to know: The Teleporter's event number is #22, which is what I had. So I check it and to my surprise, it played the Item Get jingle. So I check the menu to see what I got and it was a Missile Launcher. Huh, Cave Story Modding can be quite bizarre.
EDIT: Setting it so that "Run Event on contact" was on only caused it so that my Missile ammo would go up by 5 every time I skipped the text box. So I had no choice but to log out of the game.