Change Wifi Connection from A/B to G?

Hello,

New user here. I have my computer connected to my network with WiFi and I believe the connection is using A/B instead of G. The reason I'm thinking this is because if you look at connection information I only see the connection speed at 18Mb/s. Maybe I'm looking at this in the wrong light but previously I was connected at wireless G in Windows and the MB/s were around 54.

I'm using a TP Link TL-WN822N

Not sure if this is a driver issue or me just not setting it up right or if everything is fine and I'm just confused.

Thanks in advance,

Loren