Thanks for your support. I use the ZAP Version 2.17.0.
Let me clarify my problem. Previously, when we manually scanned our website, it would extract five websites in the site tree. We only have two websites that we want to scan, and then we added two URLs to the Default context to scan. After finishing the scan, it will show all alerts, including three websites that we don't want to show in the report. And when we choose the default context, the number of alerts will show 1,0,6,6

However, when we export the report after choosing the default context. It will export all alerts(1,2,7,6), including other websites that we don't add to the default context. We want it can show 1,0,6,6 when we choose the default context to export the report. It was workable in the previous version, but now it is not workable for the latest version.