Turning the wheel during a trackstand is not abnormal, however, you need to develop a technique that allows the leading foot to be on the turning side. If you are still swinging the front wheel in a huge sweeping path, then you are forcing the issue. It's all about being smooth on the movements.

This is not a design flaw. If it were, most all track bikes and a very large amount of road bikes would be such.

Take the advice above for what it is.