The commercial license comes with some added functionality, and support. I suspect the "for open source projects" and "for commercial software" labels aren't me

The commercial license comes with some added functionality, and support. I suspect the "for open source projects" and "for commercial software" labels aren't meant as restrictions (i.e., "Only these kinds of projects can use this license") but rather as suggestions ("If you have this kind of project, you'll probably want to use this license"). Though as it stands, it's definitely ambiguous, which is the last thing anyone wants from their licensing agreement.