Captivate 8 close caption roll back to English

Hi Captivate support,

I got an issue on the captivate source file in close caption part.

For example,

First working on CPTX, I made a change on close caption to AAAAAAAAA.

On second time, I used the same file to modify some content without touching on close caption but the close caption is changed to BBBBBBBB automatically.

     To solve this, I needed to re-import the close caption to CPTX.

Please note that I import XML and close caption document only at first time.

Do you have any idea on this why this issue occurred?