Fixtures being release from 2nd cue stack and returning to master stack when I don't want it to.

I've got multiple cue stacks in my show, all timecoded. At one point a fixture changes from being controlled by the master cue list to a secondary cue list. However seemingly randomly the fixture is released from the second cue stack and jumps to the most recent positon in the first.

Is there a solution to this?

Thanks

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