You can reproduce the steps here: http://demos.kendoui.com/web/validator/index.html
Click "Submit" without entering any valid data.
The error status "Oops!..." is displayed in red.
Correct all the errors by entering valid data and then click "Submit" again.
The status "Hooray! Your tickets have been booked" is displayed in red instead of green.
If you enter valid data immediately on entering the page you get the message in green as you should.
It seems that once you've had an "invalid" class assigned to the status that class sticks and simply adding the "valid" class doesn't fix it.