KLAS problem with t/o rwy 7L

I have fsdt KLAS to fs9.  When the active rwy is 7L/R, the AI planes don't stop correctly.  If one is h/s 7L, the next one will go right into them and so on.  I was taxing and stopped behind 2 that were both at the h/s node.  Then 2 more planes went right trough me and right into the others.  This is the only runway that has this problem. 25R, 1L/R, 19L/R all work fine.  I'd seen something about this before, but can't find the message about it nor what forum I saw it at.  I use ADE for my afcads.