You may have capped for the ad campaigns available to you. You can go to the Regional Catalog Viewer to check the ads available in your region. There are other limits set for ad delivery that are not campaign specific, so you have to take that into consideration too.
The User Solutions: 1.39.x topic has a section on ads you may want to review to help understand ads and what you are looking at on the Catalog Viewer. Reposting the section below.
Questions Answered: What about those Ads!?
Brave Ads FAQ
FAQ: Why am I not seeing Brave Ads?
Why don’t I see any Brave Ads after enabling them?
Catalog Viewer Plus Explained
Unusual activity in active campaigns in my region - #2 by Saoiray
Unusual activity in active campaigns in my region - #3 by Saoiray
Low “ptr” IC Ads preventing other IC Ads from being served by @g00z
Older post, related, with other useful info from @Saoiray.
Not earning rewards for ads
Discussion Topic: What determines the number of ads per hour
If after a review of the ad campaigns and limits, you still think you have an issue, you should submit a request using the form linked below so support staff can take a closer look. Please note, you do not have to post any logs in your request unless support gets back to you and specifically asks for them. Generally, logs are for internal support staff use only and really don’t have any useful user information. Brave doesn’t explain what the log entries do or what they mean.