Landing downloaded aircraft.

I have a problem using the approach hold on the 2 POSKY planes I have. The plane lands about half a mile before the start of the runway. I thought this was just a POSKY specific problem, but the Project Airbus plane I downloaded also seems to have this problem. The default aircraft land on the runway perfectly.Is it me, is it FS2k2 or is it the aircraft. I'd be glad to hear from anyone who could help, coz there's a lot of great aircraft being made, and I can't seem to use them!Thanks