Service Area in network analysis question

St_A

I created Service area for areas within 600 m of a bus stop. I used sidewalk network. Does anyone know why some addresses close together are excluded. Some address on the same line were excluded. Does the service area look accurate. I used detailed and it was excluding most where the sidewalks are missing. The diagram attached is the standard precision used with 100 m trim. I noticed when i increased the trim to 200m it got most of the address in that hole. should i be doing this? Green dot is addresses and the bus stop are the triangle. Thank you for your input

 

Service area standard precision.PNG