Confused About WPS LED behavior

Default until very recently was never "unlit".  No recent firmware update or change in settings for the extender; no change in router hardware, firmware or settings.  As far as the extender's manual, my original post discusses the only 2 places that the WPS LED is mentioned and they don't exactly agree.  I guess the one thing I haven't tried yet, but don't have any enthusiasm for is to do a factory reset on the extender.  I guess if I create a backup settings file I could "restore" my settings from that file.  What I don't know is whether the restore settings file, made with the currently installed firmware, would be compatible with the configuration of the extender after performing the reset.  If the reset configures the extender to restart using a firmware version that is at least 2 versions obsolete some of my settings would be meaningless.  For example, original firmware always used router's SSID plus "_EXT" to name the signal from the extender.  The current firmware gives the user the option to use the identical SSID as the router  (which I much prefer and have been using for months without problems).  I'll probably accept your advice and trust that all other indications I mentioned in my original post show that my wifi connections to and from the router are encrypted.  I live in a multiple dwelling high rise and literally everyone in the building uses wifi due to a bulk contract our building has with Comcast.