It's a fact: JIRA issues have a type such as Story, Bug or Enhancement, while Wrike tasks are all made equal. When you create a new task in Wrike and Unito turns it into a new JIRA issue, what type will the issue have?
To specify the default issue type, edit your sync and go to the Tweaks section of the JIRA tab. And don't worry, you can always change the type classification of a JIRA issue after it's been created.
Sync Settings / JIRA / Tweaks / Default type for new issues