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I don't use Site Manager, but for what it's worth, this is one of the bug fixes listed for Reflect 7.1.2695:
Workstation Edition - Backup Events
The Workstation Edition of Macrium Reflect would fail to post backup completion events in the Windows Event log. This has been resolved.
If the workstations themselves are running an older version of Reflect, you may just need to update them. The release I just mentioned arrived in mid-November, and there have already been 7 newer releases since then, some of which have fixes that may be rather important depending on your deployment. Strangely I can't find any reference in the release notes to a 7.1.2678, but maybe MSM release build numbers are different from the standalone releases.