Offsets not very good

So i was playing around with a logo.

This is how rhino offsets (in version 8):

This is how parasolid (microstation) offsets:

Obviously result from rhino is very bad.
I really dont know where the horns/spikes are coming from …
It is frustrating that i cannot simply offset curves and other thing i cannot hatch them in case of self intersecting curves.
offset.3dm (66.4 KB)

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Look, there’s the source of one of the spikes:

You’ll get a result more similar to microstation if you set the option Corner to Round.

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Indeed with round it works nicely :))