To reproduce, create a task id using one user key, then send data using another user key. As a result, you end up with data for the same task under 2 different keys. <img width="1317" alt="screenshot 2017-04-02 13 22 21" src="https://cloud.githubusercontent.com/assets/2080316/24589851/69b39e4c-17a7-11e7-93bf-25b4d274e812.png">
To reproduce, create a task id using one user key, then send data using another user key.
As a result, you end up with data for the same task under 2 different keys.