hello! i noticed when i use the retrospring.net/@[username] link my profile picture is the original one i had uploaded even though i have changed it multiple times. when i use the retrospring.net/[username] link (without the @ sign) my profile picture shows the correct most up to date profile picture. why is that? is there a difference between the two links? also, when i want to share a question to twitter the default link is the retrospring.net/@[username] (with the @ and incorrect profile picture) is there any way to default this to the retrospring.net/[username] link (without the @ sign, correct profile picture)?