Hey I see where you are doing it wrong. DO NOT DUPLICATE PROMPTS it will bring in illegal chracters, in that case delete the content groups and import new json.
HOW TO GENERATE NEW BATCHES OF CONTENTS
If you if finish a batch of contents and you want to create the next set you simply replace keywords and topics then go back and click generate via server. Dont duplicate content groups.
When you complete a batch
Replace the keywords and topics
Generate via server again - it will pick the new keywords and topics