In ARCGIS 10.1 network analysis, why results of service area are different if number of break points is changed?

For example, the grid is 300m*300m, I try to produce service area around a node.

settings are like this...

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Then I got this result enter image description here

then I only change breaks to 300,600, result:

enter image description here

Why the outside border is always in strange shape?

Why the service areas of 600m are different in these 2 cases? I try to change polygon generation to "detailed", it still generate this kind of results.

Really confused, and I have problems understanding any service area result because of this.

Highly appreciated to any ideas!

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