Merging Shows

So on hog 3 I always used the merge shows feature to copy different cuelists and such to different shows. I tried doing this on hog 4 today, and when I went to do some stuff with lights after merging the shows, I figured out the merge cleared out almost all of my patch numbers for my fixtures.

Can anyone give me any insight on why all the patch numbers got deleted and any way I can properly merge shows?

Anyone else with this problem?

PS. not all is lost, I am using a back up which brought all the fixtures back, I just lost all my work for the day.