Major Sonar Platinum Configuration Issue

Ok, I messed up something major here.  I went to export a stereo mixdown of a song with 17 tracks and noticed that before I even engaged the export feature that all the tracks were highlighted.  I understand that I have to do that to export, but I did not do it.
After playback, I decided that I would edit a vocal track in Sound Forge which I do a lot.
Upon attempting to import that track, nothing happened.  Several attempts failed.  Meanwhile all the tracks were highlighted.
 
So, I figured you win, I will export this as is and look at the result (I know, I know big mistake),  Well the export tied up my laptop for several hours and the resulting mixdown file which is usually in the neighborhood of 48,000 kbs turned out to be 23 GIGABYTES. YIKES
 
Now, I can get out of this song and easily load another song which looks normal, however, whenever I reload the problem song, I have the same highlighted multitracks.
 
When I checked the properties of the 23 Gb mixdown file there was a little media file designation of W64.  Did I somehow convert this whole thing to 64 bits as opposed to my usual 24?  Help. This is foreign territory to me.  I don't want to lose all my work.
 
Any  suggestions will be entertained seriously, for sure.  I had to inadvertently change something.

Defintely worth looking at.  Thank you.