ETC ION Channel Tracking in Cues

Hello,

I built light cues for a play and also running the board for the show. 

First few shows, there were some channels up in blackouts. I took them out, Update > Cue > Enter, all was well until the show last night - again, random light up during black out.  I'm assuming they're tracking. How do I stop this from happening?

For what it's worth - there's three other technicians running the board, occasionally and we DO use the board for other shows in between that require minimal lighting and no cues.  

I read about "Asserting/Blocking" blackout cues.  Can someone explain how this is done? 

Thank you!!!

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