TASKS mis-behave

The Tasks area doesn’t work as supposed to be:
1) All tasks within a project are accessible by all subscriber users, doesn’t matter that user is assigned to that task or not.
2) A subscriber can edit/delete a project. And there is no log for the project deletion.
3) A subscriber can assign his task to some other subscriber within the project.

I think the subscriber should not have such roles.

I am developing a website and finding some difficulties for these. Can you please assist ASAP.

Thanks.

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