The Onename webapp is not meant for bulk registrations of usernames. The underlying system, Blockstack, has a registration fee and currently the Onename webapp foots the bill for it.
Some people try to register a lot of names through the Onename webapp with the intention of squatting on them. The Onename webapp has a spam detection algorithm in place which detects such behavior and flags the registration as spam. These registrations are never processed by the webapp.
If you feel that the Onename webapp flagged your registration as spam by mistake, please contact support and they will take a look at your case.