Difference in Wifi connection %’s?

This is something I’ve wondered about for a long time…Ubuntu 16.04 using Cinnamon. On a tower computer.

In the action bar I have the Wifi icon. It shows that I’m currently connected to the local wifi AP. If I hover over it with the mouse, it shows a signal of 59% (at least today it does) signal strength.

Now if I click on that icon, I get the drop down listing of all the available wifi sources nearby. But the wifi AP I’m connected to shows 92%?

So, what is up with that? Everything works, just curious what the difference is in signals those %’s are showing.