Identity Safe Folders Disappear

I am using NIS 2013 on 3 computers.  Yesterday when I logged into ID safe some of the folders where shown twice, some with some logins & the other with the rest.  I combined them into one folder each & deleted the empty folders.  Today I logged in a about half my folders where gone & the logins where still there but not in folders.  What could be going on?  This is really frustrating after years of setting up folders.