Newbie - Forces in a gridshell dome

Hi All,

I am relatively new to kangaroo but have been experimenting with the form finding and made a basic shell gridshell.

What I am really interested in is finding forces in the forces in the cables once I apply a wind load via a pressure component. What I can't understand is I am getting tension in my shell at the top of the arches. I believe that my modeled wind pressure acting downwards so I think that all the strands should be in compression, if anyone has any idea would be great to know! the full definition is attached

Thanks well in advance!