problems in the sigfox registry

When I registered MKR fox 1200 board in Sigfox backend I used what I read from the board via serial monitor:

ID = 001DA288 PAC = 21B54DCA06325458

now when I read from the board via serial monitor, appears:

ID = 001DA288 PAC = FD2B6CA3F100D1E6

and when I go to backend.sigfox.com/ the device information is:

PAC: B61FFD779A402090

what's up, does anyone know

thanks.