When you use uTorrent, you need to set the remote port range, for an entire range. Everyone uses different UDP ports for uTorrent, so that's why it's not being enforced.
So, yours should look like this:
Source IP Range: 192.168.1.5 - 192.168.1.5
Source Port Range: 50353 (so, QoS is only active on those ports)
Remote IP Range: 0.0.0.0 - 255.255.255.255
Remote Port Range: 1 - 65535 (so, any traffic leaving through your 50353 connects to ANY other user(s) uTorrent ports which can be this entire range)
Same goes for P2P. If there's an option to choose a certain port, more than likely people won't be using the same port. So, what you just did was prioritize it from your 1 port to everyone else's range.