Translation text box appearance

Thanks for taking my question.  I don't exactly understand the blank text box.

Shared Screen view - webinar.  The smaller blank text box at the bottom, appeared during the transmission of this mp4 file.  I don’t know why.  I can only guess that I may have enabled translation ( in error) in addition to cc at the beginning of the webinar.  I didn’t assign a translator.

Can someone confirm or offer a different reason? 

How can I see what my settings were for this webinar?  This could be the template settings or any changes we made or enabled during the webinar.

Thanks for your help.