Repetition of Tasks due to no.of.members of group

The no.of.tasks is being displayed the same times as the no.of members in the group. For eg- I am having  a group with 3 members who will be reviewing  a particular task, i.e. for 3 same process IDs i have 3 different task IDs, because of which when i am displaying it in the UI, its showing 3 same tasks where it should have been 1. How do I deal with this problem?

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