GitLab issue is created with incorrect title and description.
A title for an issue is taken from the step's description and a description is from step's "Issue Title" field.

Steps:
1. Setup a GitLab issue tracker settings.
2. Add the "Create GitLab Issue" step to a workflow
3. Set also the step description, "Issue title" and "Issue comment" fields (also, Assignee and Miliestone has to be set to correct values due to QB-3253)
4. Run the build.
5. See the newly created issue. It's title has the step's description, issue's description is the "Issue title" and the "Issue comment" is absent.

Issue's title has to be the step's "Issue title" field. And the issue's description has to be the "Issue comment", I guess.