Hi Kathy,
You will want to check the feed file that is being sent from Banner to be sure that current data is being sent, and also look at the records of the import to see if there are any errors showing up in the import process. (We don't use the Banner integration, so I don't know if it goes through the standard SIS import process or not...)
You might also run a provisioning report (Admin > Settings > Reports > Provisioning) and retrieve a report of enrollments including deleted enrollments and look for enrollments for that course, to confirm whether or not the enrollments have been created and then marked as deleted for some reason.
Mike
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