From the additional information page on the arotc portal:
The approved status you see next to the document type does not indicate the request to transfer was approved, only the document was received and we are working your request. The Selection Status indicate the originally accepted school until we have processed and approved the transfer. Once approved, the Selection Status tab will indicate your offer has been accepted to the new school. The old school will disappear from the list. Some requests take longer to process depending on where you are requesting to transfer.