conditional action switched to standard action - why?

I'm working with a great deal of conditional actions in my file (rushed deadline, will spend time learning shared actions soon). All of my conditional actions on the slides were working, but I've had to add a few items here and there, so I've been revisiting the actions to add some show/hide lines. I've updated 2 slides with no problem, now on my third slide all 3 of the conditional actions I had created have changed somehow to standard actions. I'm not sure what I did to make this happen, but I need to not do it again. Can anyone provide insight?