Special:Badtitle/NS90:User talk:Robkelk/Did you really mean to add your signature to main pages?/reply (3)

It's a setting in your user preferences you have to disable.

In MW 1.23, the designers decided to make that turn on by default, but you can switch it off.

As for the signatures, make sure you didn't add ~ anywhere on the page, as that will sign your name.