Default Captions for Mouse Clicks

Hello,

     I did a brief search in the forums to see if this had been answered and did not see it.  If this has been discussed already, please point me in the right direction.

     I was curious what Articulate Storyline uses to determine what the caption will display when the mouse is clicked on screen while recording my screen.  I have been creating view mode and try mode scenes for a big lesson project for the company I work for and we recently updated our training database to the same version as the live database.  What I noticed was the default captions in the old database would say "Click on the image" and now that same object in the new database says "Click".  Does Articulate use the alt text to determine what the caption should say?  This would make sense because our software ouputs to html code.  I know this is something on our end and want to address it from an instructional design standpoint in that this is bad for screen readers and tabbing.  Any feedback is much appreciated.