Having Rich Text Data Type Field, does not the actual value after entered, saved the value.

I’m not sure I understand.  By definition a rich text field is storing the full HTML string - so that formatting is maintained alongside the text entered in the control.  This means some amount of interpretation is going on and I can imagine that some “values” might be converted to formatting. 

Can you let me know a little more specifically what the values you are enterring are that are not being stored as you would expect?