The result of kextstat command is changed.

[dodamn]

OS: Snow Leopard 10.6.2 (retail)
E/E: fakesmc, evoRestart

I got 102 kexts loaded immediately after booting. But about 1 minutes later, I got 94 kexts loaded. I did nothing except running kextstat command.
The followings are 8 lost kexsts.
AppleFileSystemDriver
AppleIntelMeromProfile
AppleSMBusPCI
AppleIntelNehalemProfile
AudioAUUC
AppleHDAHardwareConfigDriver
AppleHDAPlatformDriver
AppleTyMCEDriver

There are no errror and suspicious message in kern.log, system.log and dmesg.

Why does this happen?
Is it normal?

Thank you.