confused calendar

[MT13]

Question from a newbie.

I imported a Regular Term class into some Second Start classes, and then adjusted all the dates and some minor things-- and all of that is fine.  I had previously added the virtual class times into the RT calendar, and a few other things, like Spring Break.  Now the original RT calendar items are showing up in the SS classes, and I can't get rid of them.  I tried unchecking the colored box on the right of the "View Calendar" page, but when I return to it, it repopulates.  I think the "To Do" list is ok, but the "Coming Up" ones are the problem.

I am considering going into the RT class and deleting all those class times, but I would prefer not to, and I don't know if that will help anyway.

I'm still trying.  Any ideas?