This photo was posted on another site (click the photo for a larger image). I refrain from linking because I posted what I thought was the appropriate answer and also, there are suggestions there that I felt were off the mark and I don’t wish to embarrass anyone.
The most common diagnosis was that the problem is with the button stand and sewing, that the button placement is inappropriate. I don’t think the root of the problem has anything to do with sewing or the button positioning. The person posting the query followed the offered advice which -in my opinion- only made the problem worse.
It is important to know this dress is a copy of an existing style. The original garment shows the same problems although not as pronounced. It is difficult to know how closely the copy follows the original because the latter is shown on a hanger rather than a body, meaning, the original may actually look more like the copy were it shown on a body.
So if you have the time and are up for a challenge, fix this dress! Have fun.