Keep receiving notifications from a deleted project.

Keep receiving notifications from a deleted project.

Hi Zoho Projects Team,

We have created a project named "Apertura Nacional" several weeks ago for test purpose. We´ve assigned tasks to different colleagues during the test. After that, this project was deleted.
But one of my colleague keep receives task due notifications from this deleted project.
Since this project was deleted, what can we do to stop it?
Thanks a lot in advance,
Yong