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How can the "NVRAM config last updated" and "Last configuration change" in "sh conf" output be different:

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C4500#sh run
Building configuration...

Current configuration : 45592 bytes
!
! Last configuration change at 11:32:22 EEST Tue May 15 2012 by john
! NVRAM config last updated at 11:31:44 EEST Tue May 15 2012 by john
!




C4500#sh conf
Using 16266 out of 524280 bytes, uncompressed size = 45590 bytes
Uncompressed configuration from 16266 bytes to 45590 bytes
!
! Last configuration change at 11:54:27 EEST Mon May 14 2012 by adam
! NVRAM config last updated at 11:31:44 EEST Tue May 15 2012 by john
!

Isn't the "sh conf" for viewing the startup-configuration file already stored on the NVRAM? If yes, the "Last configuration change" and "NVRAM config last updated" in "sh conf" output should be the same, shouldn't it?

Couldnt it just be that it notifies you that there are changes made that are not saved to NVRAM yet, even though you're looking at the config stored in NVRAM.