Are you actually clicking on the "insert signature" option after uploading. This is what places the BB Code into your sigline, that tells the forum software to go fetch whatever signature pic you uploaded and then display it in the signature.
It looks like this, circled:
I went ahead and added the SIGPIC code to your sigline, so your map should display now. I put it underneath your other sigline information. You can move the code above your sigline information if you do want it on top.