The Step data not stored properly when the navigation reaches fist step via previous buttons.

[siripravi]

The step data is lost during navigation. The first step's data is always fine. But when this step(first) is reached again using 'Previous" button, The data for this step persists, but when I click 'Next' and reach second step, the data for this step is lost.
But everything is fine as long as user navigates (to-fro) between intermediate steps(except first).
The same is true for the example you have provided.
I am not using any conditional step branching. I want to always keep the step data during navigation.
Is the first step is any special and should it be treated specially?
Please help me.