When you are planning for multiple Orders at one address, it is sometimes technically more efficient to split those Orders up. In reality, however, we want to have the Vehicle stop only one time at that address (Time Windows permitting).
You can encourage this behavior by creating a Per Stop Cost on your Vehicle. This tells the planner to group Orders at one address as one stop when possible.
1. Click the Settings gear:
2. Choose Vehicles:
3. Double click on the Vehicle you would like to edit:
4. Scroll down to Cost and increase the Per Stop Cost:
5. When finished click on "Ok", then click on "Apply Now".