Snapmirror Synchronous isn't synching immediately

We have two clusters that are both running 9.7P5.  On Cluster A, we have a volume that has a CIFS share associated with it.  We then have a Snapmirror Sync relationship with Cluster B.  For some reason, when a user updates a file in the original volume, the changes aren't replicated to Cluster B until 5 minutes after the hour (or a manual update).  Our understanding is that a write to the source volume would be written immediately to the source and destination?

Below is the information for the relationship in case it helps:

Oriole::> snapmirror show -destination-path oriole-svm:sm_s_prj004_NTFS

                            Source Path: cardinal-svm:prj004_NTFS

                       Destination Path: oriole-svm:sm_s_prj004_NTFS

                      Relationship Type: XDP

                Relationship Group Type: none

                    SnapMirror Schedule: -

                 SnapMirror Policy Type: sync-mirror

                      SnapMirror Policy: Sync

                            Tries Limit: -

                      Throttle (KB/sec): unlimited

                           Mirror State: Snapmirrored

                    Relationship Status: InSync

                File Restore File Count: -

                 File Restore File List: -

                      Transfer Snapshot: -

                      Snapshot Progress: -

                         Total Progress: -

              Network Compression Ratio: -

                    Snapshot Checkpoint: -

                        Newest Snapshot: snapmirror.477874a4-49e1-11e6-934f-00a098a22fa1_2153295841.2020-08-18_110500

              Newest Snapshot Timestamp: 08/18 11:05:00

                      Exported Snapshot: snapmirror.477874a4-49e1-11e6-934f-00a098a22fa1_2153295841.2020-08-18_110500

            Exported Snapshot Timestamp: 08/18 11:05:00

                                Healthy: true

                       Unhealthy Reason: -

                Destination Volume Node: Oriole-01

                        Relationship ID: 60d303d6-db52-11ea-9aa3-90e2ba9be160

                   Current Operation ID: -

                          Transfer Type: -

                         Transfer Error: -

                       Current Throttle: -

              Current Transfer Priority: -

                     Last Transfer Type: resync

                    Last Transfer Error: -

                     Last Transfer Size: 2.97KB

Last Transfer Network Compression Ratio: 1:1

                 Last Transfer Duration: 0:0:12

                     Last Transfer From: cardinal-svm:prj004_NTFS

            Last Transfer End Timestamp: 08/10 17:57:43

                  Progress Last Updated: -

                Relationship Capability: 8.2 and above

                               Lag Time: 0:0:0

           Identity Preserve Vserver DR: -

                 Volume MSIDs Preserved: -

                 Is Auto Expand Enabled: -

           Number of Successful Updates: 187

               Number of Failed Updates: 0

           Number of Successful Resyncs: 1

               Number of Failed Resyncs: 0

            Number of Successful Breaks: 0

                Number of Failed Breaks: 0

                   Total Transfer Bytes: 15879

         Total Transfer Time in Seconds: 12