There IS a reason. you guys snatched up MARBLES. Whats a marble? A marble is a betta that changes its color as long as it's alive.
The first marbles were white bettas with black bumps on them that appeared and dissapeared and reaapeared on the fish's body.
Marbles change because of what is known as the "Jumping Gene".
Now marbles don't have the bumps and can change from red to purple and any color they darn please ;). Here's some pictures of a marble. This is the SAME
My first marble I was like "I thought that black spot was over there?" *research* "Oh he's a marble!!"
Ya it can be wierd but it's very interesting :)