@Xenix had right.
Into the screenshot “Settings > LMM”, we understand your error.
For one reason (error, inattention), you changed the “meeting item” face to “return visit” to “Talk”; it’s not good value.
After backuped your db, change the value… and tell us if it works properly again 
See the TheocBase (embedded) Help to change it — if you dont known how to do:
- F1 > Schedules > Edit the Schedules > Edit Schedules Manually > Edit a Life and Ministry Meeting Part