Sounds odd. Could you email us the .bws database file for the session, from (C:/EBUScore/Pairs/Databases folder) and also the EBUScore Pairs event file. You can export the latter from EBUPairs by clicking on Import/Export Event on the main screen, then click on Export Event Data.
Could you also send the files C:/nginx/logs/access.log and C:/nginx/logs/access.log.old
Is it possible that someone did a "Reset Table" at table 1 at the start of the 3rd Round ? That would be consistent with the wrong names being displayed and boards 1,2,3 being shown. However it doesn't explain how the device moved to Round 4. Did the players input scores for boards 1,2,3, even though they had played different boards ?
John