Mutiple Agile boards for project: configuring board behavior

Hello!

I created agile board just for front end tasks. Backlog for this board is a query: Subtask of: EIB-8773 or Subtask of: EIB-3234 or Assignee: jeengray or tag: EIB.Markup.

Also Board behavior is "Automatically add new issues to First Sprint"
I need for issues to add automatically on this board accordingly to this query. But now any issue in project appears on the board.
Example:
1. I create issue with tag EIB.Markup. It adds to the board. This is OK.
2. I create issue without tags, parents and assignees. And it adds to the board too. This is BAD.

Am I doing something wrong?
Is there a way to sidestep this?