Conditional required fields not working

Hello

I have a problem with conditionally required fields. It works only partially. I will explain the situation:

I have a dropdown field with values from 0 to 9 and there are other fields: date fields and several text fields. The other fields become required if the selected values from the dropdown are either 2 or 6.

The problem is when I go from the value 6 or 2 to some other value then 2 and 6 in the dropdown. In other words, the other fields don't become optional after they were required. I was using the change event for the dropdown with java script as script language.

Here is a more simpler example with a option field which I also tried:

after that I click option 1:

and it's still required, although it shouldn't be. This time I was using the click event.

I used the script from this thread: Conditional Required Fields

I hope someone can help me.

Thanks and best regards