Fillet edge creating some weird extrusion

I created a fillet edge as I envisioned on the other side. When I perform the same task on the other side of the shape/object a weird extrusion of the fillet edge protrudes. Why is this happening?

FilletEdge is less than bullet-proof.

Problems include, corners and using too large a radius.

To avoid, click the “Preview” button after you enter the command. That will show what rhino intends to do so you can catch the problem before you finish.

Sometimes changing the type of fillet (rolling ball, distance from edge, distance between rails) will fix the problem while previewing. You might be able to fix the problem by adjusting the radius.

If all else fails, you can create surfaces that fill in the gaps left by FIlletEdge.

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Hello - please post the file if you can, I’ll take a look.