Hi @anon33409932 Nancy and sorry to hear you are experiencing this issue!
Please have a look at our Guide article that explains how to import Custom Fields via CSV: Asana CSV Importer • Asana Product Guide. If this doesn’t help you resolve the issue, I would highly recommend you to reach out to our support team providing the URL of the Project and your CSV file, so they can try to reproduce it and assist you further to resolve this issue!
You can reach out to them following these steps . When you do, feel free to reference this thread so you don’t have to re-explain everything.
Troubleshooting CSV issues is really hard via Forum but our Support Team would be better equipped to assist you further. Please let me know if there is anything else I can help you with!