I have set up and used 5 of these.  I recently moved from MDT to EDT.  I noticed an EP10 I resumed using was still on MDT, so I researched and set the Kasa app to the new location/zone.  That EP10 was also switched to EDT as I expected.  I then resumed using another EP10 and quickly discovered it was still on MDT.  I can set its schedule using MDT, no problem.  (Both have been plugged into power since the move.).  Any  ideas on how  one EP10 would switch to the new time zone and another remain on the old?