Pixel of an image showing through

I have an image as a background for a div box that is set to relative. On top of that are two other images are set to absolute. One image is on top and the other on the bottom. All is working however, a small thin line of the background image is coming through. What could cause this?

link: Webflow - Firefly Forts

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Seems like an anomaly related to the png itself, or possibly the way the browser is rendering it.
If you set the background of the element, you can see it affects that gap, which suggests the png is offset by a pixel or getting rendered as offset.

Easy to fix though.