I've seen this on some surveys too. When I click on it, it seems it's an option to redownload the survey.
However, like you I am unclear why it has that option in the first place?
Yes. I got that message too. I'm really bewildered about it since I haven't made any changes that would warrant this type of action. It would really be nice if icons like these show up that pop-up descriptions could be correlated with each so as not play the "guess the icon" game.