Client Size of the Form doubles after minimizing and maximizing

I have a Mdi Container form which can hold multiple Child forms inside it. Now Each Child Form has a panel added to it so that it can in turn contain multiple User controls inside it. I have a weird issue when i minimize and maximize a child form , the client area of the Child form is doubling. I have AutoSize = false and AutoScroll = true.

Any help on this issue is appreciated.