AI aircraft approach to absent runway

FGBT stock airport in FSX-SE is completely wrong, perched atop  mountains along the Equatorial Guinea coast ...but the actual elevation is 13 ft. with nothing but flat land in all directions.  I downloaded addon scenery which flattened the mountains and created a reasonable airport.  AI aircraft approaching rwy 21 land successfully but on approach to rwy 03, the heading is 010 rather than 028 and the plane lands on to the east as if approaching rwy 01.  What could be the cause?  In ADE, I've examined all the data for the airport and the runways but can't find anything with a heading of 010.  I presume that AI land on an installed runway. 

(Does Prepar3D handle African terrain better than FSX where rivers and lakes are elevated like aqueducts?)

thanks