You’re unverified in your picture. Since you’re unverified, means you’re not connected to Uphold and won’t be able to see your existing Uphold balance. In order for you to see the Uphold balance from within your Rewards, you’ll need to click on Unverified and then connect to Uphold, assuming that you’ve verified with a supported country that’s listed at https://support.brave.com/hc/en-us/articles/6539887971469
You can check out PSA: Current FAQ - #17 by Saoiray where I talk about this error. It just seems like you have something that Uphold needs you to provide or do. It can be email verification, picture, to submit documents, etc.
These are only for Unverified users who have not received payments to Uphold or Gemini. If you had been connected in the past, which it appears may be based on what you’re saying, it’s why the statements are empty. Statements are just for vBAT, not for actual BAT.