In pulling the sheet metal profiles as Bent between the district and the rectangle, If you control The number of bends, there may be a strange pause. It is a consequence of this, that the upper arc converges to one point at the bottom. Taking into account the thickness, radii and the number of bends, these walls simply do not fit there.

However, there is an option Refer to endpoint, marked by default, which should be deemed in such a situation. This option is responsible for generating the approximate arch in the corner.

However, in my opinion, it is safest to simply add rounding in a sketch, which will smoothly distribute the beating between the lower and upper arches. In this case, selecting or awarding the options Refer to endpoint nothing changes.