Sweepdraft not intended behaviour

Hi there, I am using the Swepdraft and can't make it work to go from a start plane to an end plane.
as you can see below, I use 2 planes to have a start and an end to my surface.
 

I have set the modlns to UptoSurface
 

 

But the created Surfaces is clearly cut at the curve and misses one side!

 



Anyone else has the same issue - is that a bug?