1) This is normal. The quantities are not imported. You need to create in initial inventory in OpenERP. Then, the quantities are always handled by OpenERP.

2) I don't have much information to be sure what your problem is. Check in the jobs (Connector > Queue > Jobs) if they are in error. You may need to configure the payment methods (Sales > Configuration > Sales > Payment Methods) for theses orders. A typical issue for importing the historic sales orders is that the payment methods are configured by default to cancel the import of the unpaid sales orders since more than 30 days, so perhaps your sales orders are just being ignored because considered as unpaid and older than 30 days.