"Make best answer" more than once?

Okay so I was wondering whether or not I can make more than one "Best Answer" to my question. I tried to but it seems like I can't. What I did figure out tho was that I can change the "best answer" many times and each time I do that the person gets 50 points. I was even able to give the same person 50 points twice... Is this how it's suppose to be or is this a glitch?

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