My parent rows are not rolling up start/end dates and "Status"?

I have some parent rows where rollups are working (duration, start date, end date and % completion, status), while other parent rows only show duration and % completion- missing "rolled up" start and end dates and "status".

Under "edit project settings", I have dependencies enabled (I checked for "duration", "start date", "end date", and "% completion" and "status"

columns). Why are some parent rows working while others are not?

Answers