You can not target/block more than 1,500 sites even if I can see only half blocked

Hi Peter,

I'm receiving this error:
{"http_status":400,"message":"You can not target/block more than 1,500 sites.","offending_field":""}

I know the limit is 1500 per campaign and 1500 per account limit. We have blocked 1121 blocked on the account level and 463 at the campaign level.

But I don't understand why we cannot block anymore at the campaign level as I can see that we blocked only 463. There are some cases where we request to block some publisher_id and I can't see it in the blocked list even if I received the OK message.

Campaign id: 4667401
https://www.screencast.com/t/rpQvZ4Vdm

Our account is: "[email protected]"

Thank you!