@Support, if we deactivate the job and rerun this job or a task, the folowing trigger rises too no mater what. The only solution that let us rerun with no indesirable effect could be to deactivate the server, but this is not an option.
@Thomas, thank you for your solution, but the problem is the same if the last task should be rerun.
As I can see ther is no good solution and it's a real problem as the jobs number rise.