I'm running a service area analysis and when I put my polygon generation settings to detailed most of the resulting polygons seem fine, but I end up with strange gaps in a few places that should be within the service areas. When I change the settings to generalized, the resulting polygons are including large areas of land that should be gaps within the second ring of my service area. I've included examples in the screen shots below (the blue lines and green dots are my SND, and the orange dots are my entrances/facilities.) If anyone has any insights into what might cause either of these issues, it would be much appreciated!
Other polygon generation settings I am using are:
Trim polygons: 200 meters
Merge by break value