Hi, since my kindle 3 (or keyboard) was automatically updated to firmware 3.3 via wifi, it has gone mad

The problem was that doesn´t sort by the most recent ( the last I was reading), it sort it by the most recent I had input in the kindle memory.
At first time I thought it was because it was jailbreaked for change screensavers. Once removed the jailbreak and return to factory settings this was solved.
But three weeks later, again the same problem.
I don´t know what happens, but its very frustrating never had my recent book in the first position
Somebody have the same problem? Or know how solve it?
PD: sorry for my English, is a little rusty, I know it