Today I realized that from the 16th stage one of the campaign has stopped sending.
I looked at the history log and the error status is "CurrentlyWaitingInSameInteraction"
Looked up on google and it seems that the contact already entered this journey and is in a wait period.
I haven't changed anything to the journey or any DE that are used in the journey so I'm a bit confused where to look and what to check. Everything seems to be fine.