calendar transfer from MS outlook to EM client issue with notifications

I read my last explanation of this and I did not do it well so I am trying again. When I imported from the .pst file, the majority of my notifications were no longer there. ( I was behind)  When I check, they still how they should be notifying AND when I try moving those same ones forward to get them to pop up for example tomorrow, they don’t pop up even though they show a reminder of 15 minutes. Do I have to recreate the calendar event or is there a way to get them to show up?  there are about 50 of them.