Apparently I'm a moron. I didn't realize I needed to check the box next to each port forward that I set up. There should really be a "Check to enable" or "Check to make active" at the top of the column of boxes, because I assumed by putting in the device name, port, IP address, and setting it to "always" that would turn it on. Nowhere does it indicate that the box needs to be checked. Maybe that's a D-Link thing because none of my other routers have been that way (Linksys, Netgear, TP-Link, etc).