Help with Shape Files

I am re-doing an airport that has MAJOR elevation changes from the runway side to the “industrial” side…all looks good in the Dev Mode. When I build and export the runway is much higher that the taxiway? In the PackageSources/Sceneries folder I have 5 files:
.dbf
.shp
.shx
and 2 .xml’s?? One called kgoo no bldg.xml and one called KGOO.xml?

is this correct?

Also I have those two files in the scenery folder? Just trying to understanding why it looks fine in the Dev Mode but not after the export. Thanks for any help.