Omgosh, I found the work-around that finally began working for me.....
Okay, the problem is that during each dynamic xml layout change of the form, the drop down list value (previously selected and chosen) is reset.
Make sure that you go to your object's "Binding Tab" and make sure that you specify Item Values AS WELL AS choose the "Use Name" drop down arrow button should be selected.
Now when my form layout changes, it doesn't revert the default option/value. I hope you found this helpful.