Problem with analysis tool "Vehicle Routing Problem"

[mirellafaccini]

 

I'm working with route optimization for garbage collection in a city and using the VRP analysis tool. 
For this I vectorized all the houses and inserted a field with the production of trash for each of them, 
I have a shapefile of the ways and all its restrictions. 
I'm finding some problems with the garbage truck returning in the middle of the road, 
instead of going through its entire length (red circle).
In addition, the truck, when passing by a lane, collects only a portion of the existing garbage, 
creating the need to return later to collect the remaining garbage (blue circle).

 I've attached an image to illustrate the issues.