chrome forgot my passwords

when i started chrome today all the website asked for my password like yahoo mail, facebook, sevenforums, a tennis site that i frequently visit, and the chrome didnt fill in any of these password

however when i filled the password, google offer to remember it

RolandJS said:

Does the computer run any sort of background or foreground PC cleaner-upper, privacy-monitor, speed-upper, etc.?

no not at all

and this is first time that this happened