Menu spacing in Storyline

I'm having some spacing issues in the Storyline sidebar menu.

I have a scene with several slides, and then the rest of the scenes just have one slide. I get why there might be extra space after the multi-slide scene, but not sure why there would be an extra space further down the menu. I'm attaching a screen shot of my menu (pixelated to protect my client). There's an arrow indicating where the extra space is. I know it's small, but my client noticed it so I need to deliver a perfect menu to them. 

Any suggestions on why that extra space is there? I checked, and my scene title and slide title are single lines.

Thanks!

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