If you have elevation problem, you can be sure it's NOT a scenery problem, but something cased by 3rd mesh and/or vector products. If you have something from OrbX, their forum has several fixes to their products to repair the issue caused to airports.
This, assuming your problem is what you reported it, meaning "there is an plain plateau or the the familiar elevation issues". If with this, you mean you see the whole scenery, but it's raised/lowered or has any other similar issue, then you can be sure it's another scenery problem.
If, instead, with "there is an plain plateau or the the familiar elevation issues", you mean you have a plateau INSTEAD of the scenery, so you don't really have "elevation issues", but you are just MISSING the scenery, that's an entirely different issue, so you should clarify what's your case.