In order for rounds to appear in the Trade Operations screen the following criteria have to be met:
The rounds have to have been generated.
The rounds have not been deleted.
There are lifts assigned to the round
If the "Hide Rounds With Zero Planned Lifts" option is enabled then any empty rounds will be hidden from the screen
The user has access to the location that the Trade Contracts are set up against.
If you have checked these and are still not able to see a round then please raise a case with the Support Team.