The Advanced Portal reports for Jira Service Management does not currently support Issue security levels. This means that even if you have set restrictions using the Issue security levels in Jira, the Advanced Portal reports will not take them into account when displaying the tickets in the report.
Taking Our team currently investigates how the app can take into account the Issue security levels is currently under development , so if you need this, please raise a ticket in our Support center and we will let you know once it is fixed.