The longer collection interval combined with the 30 minute default Federator sync interval will result in no current dashboard metrics displaying (60m/1h interval). This is expected behaviour.
Wait approximitly 30 minutes or 30 minutes after a Federator restart for a Sync to occur.
The out of Sync data may also pertain to recently created agents and changes to Agents (collections, etc). Recommendation is to wait 4-24h for all data to be collected by the down-level Child FMS agents where configured.