The Differences window does not show all the files that are copied, deleted, moved, etc.
Check to make sure you have not filtered out some of the files from the Differences window.
SyncBack V9 (or newer)
When the profile is next run, and the Difference window appears, click on the Filter tab and tick the check boxes:
Show files/folders not on Source/Left (*)
Show files/folders not on Destination/Right (*)
Show changed files
You may also want to tick the menu item "Show skipped files/folders" and "Show files skipped due to rename".
SyncBack V7 and V8
When the profile is next run, and the Difference window appears, click on the Filter main menu item at the top of the window. The following sub-menu items should be ticked:
Show files/folders not on Source/Left (*)
Show files/folders not on Destination/Right (*)
Show changed files
You may also want to tick the menu item "Show skipped files/folders".
(*) The exact text depends upon the names you have given to the source and destination folders.
SyncBack V6
When the profile is next run, and the Difference window appears, click on the "Click here to see more options" bar at the top of the window. The following checkboxes should be ticked:
Show files/folders not on Source/Left (*)
Show files/folders not on Destination/Right (*)
Show changed files
You may also want to tick the checkbox "Show skipped files/folders".
(*) The exact text depends upon the names you have given to the source and destination folders.