Bullet holes 3D/2D problems

[Guest]

When playing my level bullet holes appear on invisible walls, some only appear on one side. This is spoiling the game as you cannot kill aliens if you're shotting a wall.
When I look at my level through Build in 2D or 3D mode no walls exist in these areas.
I have looked to see if these phantom walls are extensions of other walls but they are not on the same grid line as any other wall.
What is going on?

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[Usurper]

As far as I know, it's a fluke. It happened to me once. Had to delete the sectors and rebuild them.

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Usurper
DN3D RTCM (http://dukertcm.totalconversions.com)
The slacker has awakened!

[peter_m_green]

check if itscan is on on those walls it is shown in 2d mode by a double line for the wall if it is on turn it off if it's off turn it on and back off now try the map in duke again

[NutWrench]

Split up those long walls by inserting some vertexes and the floating bullet holes will go away.