This article provides detailed explanations of the Issue Reports available in PPO:
Issue Detail Report
The report includes all the fields on the Issues entity for all issue records and projects. If the “Include Project Information” checkbox is selected, the report will also include all the fields on the project entity. This report is only available in datasheet view.

Issue History Report
The Issue History Report shows when the issue was updated, by whom and what the recent issue action/response was. This provides a complete view of how the issue has changed over the lifespan of the project. The report can also be filtered further to only include issues related to certain projects. This report is available in report view, datasheet view and PDF view.
Issue Report
The Issue Report shows all the current issue information (no history records are shown on this report). The report can also be filtered further to only include issues related to certain projects. This report is available in report view, datasheet view and PDF view.