there can be multiple possibilities here.
1) you should check the queue's for sales orders in Tx. SMW01.
2) you also need to check the subscriptions for business transactions in Tx. SMOEAC.
3) most importantly verify with your developers if there is restriction in place with regards to sales orders status implemented with respect to order replication. (Badi;s to check { in CRM} are
CRM_ORDERADM_H_BADI ; ORDER_SAVE).