Try checking your Front Clip and Back Clip distances in the section editor, in View/Edit Options.
Mine are set to 0.1 and -0.1.
Thank you Mr.Andrew for your effort.
As you can see in attached file iset all thing as your setting but nothing happen.
I think my issue here as you can in attached file there are additional subassemblies(fake) beside my original one and let me tell other station had a link code and everything was ok because there weren't any additional subassemblies.
May if you haven't any idea i will post my DWG.
I figure out an issue and let me explain what happened.
Additional subassemblies(fake) appeared at hairpin location only
As you can see in attached file i have a hairpin in my project
For your Advice
In the section editor, you can use the "Viewport Configuration" command on the "View Tools" tab to set the view to show the plan and section (and the profile) which might have shown this a a bit earlier.
Can you give your email because i can't upload more than 1.5Mb here in this forum
You can download my file that describe my issue from the following link:
Your files are ready to be downloaded by your recipients
Start with some of our most frequented solutions or visit the Installation and Licensing Forum to get help installing your software.