"short answer question" exported as html5 issue

I'm using Captivate 6 to create a html5 project in which I use the new "short aswer question" feature. Inside the html5 file the text box for the short anser is covering the correct/ incorrect captions for this question. The feedback text for this question is very big so I cannot make smaller caption boxes. I've already tried to "move to front" the captions and to "send to back" the text  box inside the master slide for the questions but without any result. I looks like the z-index of the text box for the answer is always bigger thant the one for the captions.

Anyone has a solution for this issue?

Thank you very much!