The reason you have to revalidate your email is because your email you have listed on your profile here was bouncing when newsletters, promotions, etc go out to you. Once the bounce happens so many times in a row, it automatically sends your account into a "revalidation" status until you confirm your email is valid/correct. When validating your email we have to ask the password to ensure that it is you and not someone trying to change your email. This measure is to protect you and keep your account safe.

So no hacking attempt or anything else has been made, this issue for you was due to multiple bounces to your email address.