title: When I scroll down, my selected values disappear from my tableviewController and pass null value to service
body: <p>I think my question might be confusing, so let me try to explain it in detail.
  Below image is my tableViewController.</p>
  
  <p><img src="https://i.stack.imgur.com/fe1rA.png" alt="enter image description here"></p>
  
  <p>Now, as you can see I have selected four different values. If I click on save button now it will work fine. However, when I scroll down, Then the selected values disappear.</p>
  
  <p>Does anyone have any idea of how to solve this?</p>
  
  <p>Please ask me if its still unclear to you.
  Thanks</p>