This is what I can see here, and it's what is supposed to happen. First one is with 100 ft, 2nd with 1ft, it's your file, edited with AFCAD and saved back.
As I've said, I don't know why it doesn't make any difference to you, but it's very well known that, in order to get rid of the default hold short zone in FS9, you need to set the taxiway linked to the hold short zone to 1 ft.