Welcome to the Discuss community and thank you for your stellar patience with us!
Thank you for confirming that you’ve deleted and recreated the API wallet. We’ve seen this error impact only a few wallets, though we’re keen to resolve the issue.
Our dev team has this on their roadmap, and if you would like to be notified when this error has been fixed, please connect with our support team and request this notification.
In the meantime, I would suggest using CSV files from stake.tax. If you upload the files into the same wallet then it would create duplicate entries, so it would be best to create a new wallet. You can use your SOL public keys, enter the keys into stake.tax, and then generate a CSV file.
I understand this isn’t ideal and my apologies for the inconvenience of not using API for the moment. This is a temporary solution to not hinder you importing your txn data into the wallet.
Thank you for bringing this to light, KryptoKana!
Have an awesome day!