Hi @mohammad didehbanmehr we are sorry to hear you're facing this issue.
Can you please share with us how you're deleting your domains? are you using Azure Front Door or Azure CDN. If you're using Azure CDN with your Static Web App, try purging the CDN cache: - > Go to your CDN profile in the Azure portal - > Select the endpoint associated with your Static Web App -> Click on "Purge" and purge all paths.
Also, can you check if your domain has been completely removed from your Azure Static Web App using Azure CLI:
bash az staticwebapp hostname list --name <app-name> --resource-group <resource-group-name>