Symptoms
Activity line merge does not appear to wait for all lines to complete meaning the Activity that brings all the lines together fire multiple times.
Diagnoses
This is a bug in the product
Sample Repro
1. Create a new workflow
2. Add a placeholder with 3 outcomes
3. Add a placeholder at the end of the 3 outcomes
4. Add an email activity and configure the 3 outcomes to go to this activity
5. Select the merge to wait for all previous steps to complete
6. Change the Display Name of placeholder 3 to hang out and change the Display name of the email event to Placeholder3.
7. Run the workflow and note that 3 emails are sent.
Resolution
For this case the design was changed to move away from this, but the bug is slated to be addressed in Appit 1.5 update 4 later this year.
