I was slotted for an activity and now some of my other preferences have disappeared from my application, is that supposed to happen?

Yes.  When you're selected as a primary for an event, the other events that  have date conflicts will be removed, since you can't be at two places at once.  If you are a primary for AMMA, and that occurs at the same time JFA PJOC-AZ, CFA-NCR and SUPT-TX, your other selections would be removed. If you also had NBB, it would not be removed, since there is no date conflict.

 

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