DFS – diagnostics report

check the DFS Replication event log for any warnings/errors?

Log location:
Event Viewer > Applications and Services Logs > DFS Replication

Also create a DFS diagnostics report and paste the results here.

Creating a DFS diagnostics report:

1. Select the DFS replication group, on the right-hand side click Create Diagnostic Report.

2. Select Health Report. 

3. Select a name and location for the HTML report.

4. Select all the DFS replication member servers.

5. Select Yes, count backlogged files in this report.

6. Create.

Powershell:

Restores files and folders that DFS Replication previously preserved.
Restore-DfsrPreservedFiles