3.73 but still jailbroken?

I havent used my ps3 for a week until last saturday, I got a problem with multiman, all of my games on my hdd doesnt show up, i checked my firmware version and it says 3.73, (im on 3.55 rebug before), I think my little brother updated it, but I dont know why it's only 3.73.

I opened multiman again then pressed L1, it shows all my games and it is working.

I dont have any idea what happened to my ps3, it says 3.73 but did not lost jailbreak.

any idea what happened there?