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FSX Airport Elevation Problem

Dear Friends,
I have changed the Elevation of my airport and this is what i've got :eek:
Only the runways changed there Altitude but not this mass of land.

Can some one help?
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Have not run into that myself, but try this:

Create a polygon (green blob above viewport) and outline your airport (usually where the fence would be) and double click the last point you need to add. In the next window, select AIRPORT BACKGROUND in the top box and FLATTEN EXCLUDE AUTOGEN or any of the other options..that should put the entire polygon at airport elevation keeping everything flat for you.
Thank you Aaron for this idea but unfortunately it is not helping :(
So i will tell you now everything i have done so far:

At first i have flatten the whole island to 0 with SbuilderX.
Then i saw that the airport is not flatten down with the rest of the island so i made this via ADEx.
As you can see the runways are on the right altitude but this mass of land doesnt want to flat.

Now i have deleted everything of the airport except the runway (i have also moved it on the correct real world position). - Still no result.