Error while creating a random dataset, duplicated voice response.

**Describe the bug**
Every time we create a random dataset, we get a duplicated voice response, it makes no sense.

**To Reproduce**
: generate a random dataset with 6 columns

**Expected behavior**
A clear and concise description of what you expected to happen.

**Desktop (please complete the following information):**
 - OS: MacOs 10.14
