SECOND LEVEL question logic display and input values do not appear to be "sticky" on previous-next button.

In my test I have set up a series of 5 questions with the below logic.

Question 1  <-- PRIMARY QUESTION

|--> If Q1=Yes then Display Quest 2 (Dropbox)    <-- FIRST LEVEL LOGIC

Question 3  <-- PRIMARY QUESTION

|--> If Q3 =No then Display Quest 4 (YES/NO)   <-- FIRST LEVEL LOGIC

   |--> If Q4 =Yes then Display Quest 5 (YES/NO)    <-- SECOND LEVEL LOGIC

In the test I select all values that result in display of all question. I answer each question, and click the NEXT button. Then I click the previous button to see what is "sticky"

The test reveals...

1) All Primary Question values are sticky

2) All First Level question values are sticky

3) All First Level questions are displayed according to question logic and stick primary question values

4) Second Level questions are NOT displayed according to First level sticky values

5) Second Level Values are not sticky (in this example the time value is sticky, but date value is not)

Video example here:

http://fresh-start.com.au/wp-content/uploads/2016/04/zoho-question-values-and-display-not-sticky-with-second-level-question-logic.mp4

Please confirm and provide fix