Fillet Edge problem

Hi…how to do it correctly to have fillet in the corners? After FilletEdge command with radius 2mm Im getting this crap :frowning:

Upload a .3dm file with a sample of the geometry. Drag the file to where you type a post or click on the vertical arrow icon above where you type a post.

How do you expect this fillet should end?

see this video-

thanks :slight_smile: