That likely would be the issue. Did you make sure to change your system info around?
What we typically see happen as the cause when people see ads but don’t get the BAT is that they are in one region but viewing the ads from another. So if your device’s Locale says you’re in Europe but your IP address say you’re in US, then it likely would be showing you ads from Europe but then it wouldn’t be able to count because you’re in US and can only view ads from your region. Since the advertiser paid for someone in Europe to see the ad, they can’t pay US for it…if that makes sense.
So you’ll need to make sure IP address and your device Locale match. Also the thing to watch after is if you stop seeing ads or the problem isn’t fixed after, as it might have flag you after a while thinking you’re trying to bypass their ad restrictions. If that happens, you’ll need to contact staff with your Wallet Info and all, which I talk about in the FAQ at -Retired- PSA: User FAQ - Support & Answers