User name change?

I used “bitsobrits” on this site for years, now I see I’m listed as “Steve_Williams”.
Why did this change occur?

Most likely you were a member of the old site. When all messages were imported from the old site to the new, all member accounts were automatically recreated using the format Firstname_Lastname.

Please also beware that you can change your username to whatever you want, but per our rules you must display your full name as your actual name.