If you read this message, can you provide more context please? Are you choosing the "Name the country" mode with question from "Same continent". It might be that south america has only 13 countries in my database, so it appears to be repeated.

I just turned the repo public for your reference.

Country list at https://github.com/kmcheung12/geo-dude/blob/main/server/coun...

Picking a question from a continent is shuffle and then pick question per round, so "pick without replacement" https://github.com/kmcheung12/geo-dude/blob/main/server/inde...

Disclaimer, used a lot of AI so I didn't read every line of code