Fortunately for you, you are speaking with somebody who has basic network training, so I do.
-47DBM is an excellent signal! This means that your signal is in the GREEN, which is great news for you, because it means that your WIFI router is in good shape.
65MBPS is also an good link speed, 135 would be better, but thats limited to hardware SPEC, which suggests, you are getting all of which your WIFI router can provide in WIFI mode, or at least, within the capacities of the WIFI receiver within the phone.
It looks like you don't have a fast internet connection though, its showing only 17MBPS for the PC and 16MBPS to your phone. May I ask, what are the speeds that you are supposed to be getting from your provider?
You can go ahead and try a different WIFI dongle if you'd like. If it were me, I would personally be buying this for a replacement. Its rated for Linux use, and gets and IT Network Admins approval!
Wireless USB WiFi Adapter