Hello,
Rewards vary based on campaign limits and ad views. You can learn more here: FAQ: Why am I not seeing Brave Ads?
If you are seeing recent ads in your 30 Day Ad History, it is likely working as intended.
If you’d like you can submit a ticket here and we can investigate: https://support.brave.com/hc/en-us/requests/new?ticket_form_id=1900000382047
Thank you