CRM 2011 Javascript : Date fields becoming null on Save

I have an issue regarding CRM 2011 DateTime field..

The scenario is this, I have 10 Date fields in my form..

After I set a value on "datefield_1", the "datefield_2" value should then be Required, onLoad using JScript, (and so on, so forth)

The problem is this, when I reach and populate the "datefield_4", and then save it,  the values of datefields 2 and 3 is becoming null on load.

I have a JScript that sets the requirement level to business required on form onLoad if the previous datefields are != null. And I have no scripts that sets  ANY value to null.

( I am using CRM Online)