That's normal.
In your settings, UPnP is enabled by default and WS will attempt to automatically map the port via communicating with your router if it can find an open one. This happens when WS is first opened. This port might change each time you open WS.
However, when you port forward, the port remains static. It needs to be static (remain the same) and needs to match the port that was port forwarded in the router.
The bittorrent ports might be a built-in default, not sure about that.

There is a chance something is blocking WireShare. Firewall/router. But the question also is what is causing it to open in multiple windows.