You are misunderstanding what a board does.
Projects contain issues.
A filter returns a list of issues, often with a simple "project = X", but they can be much more complex, with things like "project in (x, y, z)" or "issues assigned to me" or "project in (x, y) and issue type = bug".
A board is a view of a filter.
So, when you create a board from a project or filter, it is always going to show you the issues in that project or filter. Because it's a view of those issues.
Also, a board does not belong to a project. You can't "create a board in a project" because they don't go into projects.
You can do the "new blank board" though - create a new board that uses a filter that returns no issues.
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