Accuracy of doorbell camera signal strength

I have the Ring battery doorbell pro and chime pro. I moved my chime pro around to various outlets to test the wifi signal strength at various locations. The location that I settled on shows a chime RSSI of -39. When I placed the chime pro at this current location, my battery doobell pro showed a RSSI of -56. But later, I noticed that signal strength decreased to RSSI -59. Then, later I noticed that it had decreased further to RSSI -63. It is now reading RSSI -67. The chime pro has not changed locations and continues to show an RSSI of -39. When I used my android signal analyzer, the signal analyzer shows a higher signal strength at my front door than Ring's device health shows. I am wondering whether anyone else has seen a discrepancy between what an analyzer shows and what device health shows. I also do not understand the continual degrading of the signal strength with no changes having been made.