I've bought a PA717 Kit. I connected them no problem. When I was pairing, I realised my husband had a WPA version (model unknown without disconnecting I think but it has paired to the Utility app) plugged in directly beside the router and connected via ethernet also. I had a problem and TP-Link sorted it (power saving mode).

Anyway the problem I have now is that my router was only providing 1 bar on WiFi, with the powerline adapters (1 located 10ft from the router and 2nd located 10ft from the first, I am trying to access Internet 6ft from the 2nd PA) I was getting 2 bars (well initially it went full but has decreased to 2) but if I connect to the WPA via WiFi I get 3 bars.

Can someone explain to me how I can get better connection on the extender than the actual router for WiFi, when they are right beside each other? Is it because it is an extender/booster or is there something else? Our router is the best they offer. 

Also: the 1st PA is showing 3 lights, including ethernet but it isn't connected via ethernet. The 2nd PA is only showing 2 lights which I assume is correct. Of course WPA version has all lights on which is correct. Why is this? Any logical reason for it? Should I swap the PA'S around to see if it increases my signal, should I remove the 1st one to try to increase? 

Sorry, I'm technical to a degree but this is way beyond my skill set.