I have added few recipients using an import workflow (data upload --> enrichment-->deduplication --> update data). The worklow ran fine without any error, but I cannot see the newly added profiles under the recipient folder (profiles & Targets --> Recipient).
The newly added profiles can be viewed in the data tab of Data Schemas--> nms:recipient as well as the exteded recipient schema. Also, I can filter the recipient with query activity.
In your Data Schemas data tab, add two columns - [nms:recipient]/folder/@internalName and [nms:recipient]/folder/@label
Compare the folder of your existing recipients and the new ones you are inserting. The Recipients folder under Profiles and Targets will probably look at nmsRootRecipient folder, so wont show any others that are put in a different Recipient folder.
Data Schemas data tab will show all recipients regardless of folder