角材料（8）验证返回奇怪的文本

I am working on a Request form using Angular Material (8). I am trying to write proper Validators and Error Messages for each of the fields on the form. As of now, I am getting the following errors associated with the fields. 为什么在表单中进行此操作？任何帮助，提示或建议，将不胜感激...