Bridge & your devices · Collab Sync
Why does Collab Sync tell me to check my Mac's clock?
Short answer: Collab Sync compares times to pick the newer file, so it warns you when a Mac's clock looks wrong. Turn on automatic time in System Settings → General → Date & Time on that Mac, then review any conflict copies.
Collab Sync decides which version of a file is newer, so it compares times carefully across the two Macs. If one Mac's clock looks wrong, it tells you rather than letting that Mac quietly win.
On the Mac in question, open System Settings → General → Date & Time and turn on setting the time automatically. Then let the folders sync again; any file kept as a conflict copy can be reviewed and restored.