Seeing outline with stroke off?

[SuperSGL]

This was from an old file I revisited with two clouds in the scene. Don't remember If I used an outline for the clouds in the beginning or not. But now they're showing a light grey outline. It renders this way as well? the stroke size is around the default 4 and it also draws on the outside of the line. Sorry don't have a place to put images. Figured it out (sort of) I tried copying and pasting to see If I could get rid of the outline but when I pasted it it was just an outline no fill. Some how I managed to get two shapes overlapping exactly. They would move together even when editing. My first tip was that the outline was only around the edge not through it. I had to zoom way in to select just the outline.

[Hoptoad]

Some how I managed to get two shapes overlapping exactly.

It sounds like you may have an unwanted shape that is only the stroke (line), no fill. That's easy to do. When a shape's points are selected, copy/paste puts a duplicate on top, and the points line up. It no longer surprises me when I delete a shape to still see a shape, because I had copy/pasted it at some point by accident while I was moving shapes around and changing colors and so forth.

There are various methods to discover stacked shapes. Deleting the shape and see if it's still there: that's my usual method.

You could also use the magnet tool to jiggle the points, then select a single point and press TAB to select all the points in the shape, select the shape, then delete the unwanted shape.

Regarding shapes, knowing what the problem actually is, that's often the tricky part. Once you know what's amiss, solving the problem is usually not too difficult.

[SuperSGL]

Finally figured out how this happens. I created a closed shape with just Stroke, pressed U for create shape and selected just fill. This creates the fill on top of the stroke. They move together and the stroke is only on the outside of the shape. In case this is a look you want. especially handy for brush type strokes. Just have to remember you actually have two shapes.