drop down list going null on success action

drop down list going null on success action

I am rebuilding a few (lookup) drop down lists as the user goes through the form.  When I get to the success action and try to use the field values they are null.  Previously it was working, but all of the sudden I was getting null values.

I checked everything and put in alerts and info to see where they were being changed.  To no avail.

My question is.

Are the input actions executed again during Submit?  This is the only thing I can think of.

I rebuild certain look up fields depending on previous selections.