What's wrong with my formTool?

Hello, I can't get the formtools working. The color are wrong and the only way to get it correct is to make a step, then open again the part and create the formtool from the step.
But even, when I insert it to a 1.5mm metal sheet, I got an error message regarding the radius vs tickness.
I will be glad if someone can explain how to solve it. Thanks