I downloaded the addon scenery for ZUNZ from this site, however there seems to be something blocking a portion of the runway which also sticks out into the river which should not happen in real life.
Is something wrong with the scenery? (I followed the installation instructions)
Try removing the old one and replace the new one, don't load new on top of old.
If you have other scenery for that airport that was installed a while ago it may be interfering with this new one.
Let us know how you do.
This is the only scenery I downloaded for this airport.
Oh and by the way this airport does not exist in default FSX,
Why not try this and see if it's any better.