Kids bike front wheel falls to the side while on kickstand
Bicycle handlebars and fork are supposed to turn feely, so the fork turning to the side the bike leans is not a problem.

It may be the angle of the fork, weight of the bars or the angle the kickstand put the bike at that make it do this more than other bikes.

You can check the headset bearings (the bearings that the fork turns on) are loose by holding the front brake on and rocking the bike backwards and forwards. If you can feel the fork moving in the frame the bearings are loose, of you cannot feel any movement that are fine.