TuMan exports show differently in ProMan

Hi,

i am currently getting started with WinProp and I ran into an issue.

I managed to create a tunnel geometry and I successfully expoted it.

Now when i open it in ProMan the tunnel does not look like the one i planned in TuMan at all.

Anybody have n idea whats the issue here? Why does the crossection I assigned to the segments not stay the same?

Greetings