Not sure if a bug but when editing my profile the website url field wouldn't recognize www i had to put in http:// so i wouldn't get an error message.

All web addresses should start with either http:// or https:// which is why the system checks for that. Although I suppose the system could be setup to add it for you,

Edit: Have removed the requirement of http:// and have set the system to add it if it's not already present.