Flat Pattern is wrong

Hi everyone,

I have a problem with a the flat pattern of my part. The flat pattern is simply... Wrong.

Part is a simple piece with 3 bents on 3 adjacent sides, all in the same direction. When I use the unfold function, I get the right pattern, the one with trimmed corners (shown in green). However, when I use the flat pattern as usual in drawings, I get regular 90º corners. There is no way it can be bent properly. 

I usually don't have any issues, so I don't understand why this one is wrong. 

SolidworksSheet Metal