Wunderlist Zapier Integration creates Duplicates

I have created a Zapier integration between Wunderlist and WeekPlan.
In the integration settings I have left the date field as blank. When I run the zap,

• I see one entry in the List I selected and one entry on the current date.
• When I delete one of the tasks both are deleted.
• When I drag the item from week/day planner to parking lot list both are present in the list. But on page reload one of the duplicate goes back to current date in week/day

I verified the number of tasks fetched and number of tasks sent by zapier and it was only 1. I am evaluating WeekPlan and I would like to know if this will be resolved before I purchase pro