Sentry not showing errors in Issues

i am using Sentry with Django in my web application and until nine days ago everything was good but from nine days ago errors not showing in Dashboard>Issues
i can see error events in Dashboard>Transaction but not showing log in Issues
i create new project in Sentry and change my application SDN config with new Sentry project but as above errors not showing in Dashboard>Issues and just showing error events in Dashboard>Transaction
i using django 2.2.* and sentry 1.0.0
how fix this?