Task Actual Hours are hours entered from the start of the task to till date. It is not dependent on the Date Range Filter on the report.

 

Total Hours are the number of hours entered against a task for a specific period or the date range selected on the report.

 

Total Hours in a project report can be equal or lesser than the Task Actual Hours depending on the date range selected. However the total hours on a time report can be greater than the task actual hours because the total hours on a time report includes time off hours which Task Actual hours will not track.