There are no duplicate runways anywhere in our AFCAD. What you are looking there, is likely an ADE bug, which is mistakenly identifying a double runway that doesn't exists, which was supposed to be added by ADE itself to attach the old ILS not in use anymore.
Proof of this are:
- The source .XML file doesn't contain any duplicate runways.
- Decompiling the released .BGL with ADE own BglToXml utility result in an XML file with not duplicate runways, there are only TWO fake "water" runways there, with different designators.
- Opening THAT XML ( the one decompiled by Bgl2Xml ), in ADE, shows THREE fake "water" runways, when the XML clearly has only two. Two of them have duplicated designators, which is considered a bug by ADE but, the issue is, there are only TWO water runways in both the .BGL and the .XML decompiled from that, not THREE. The extra one must have been added by ADE when opening the file, it's just not there in the scenery.
So, it's clearly an ADE bug ( we'll report it to the author ), so your crash wasn't caused by our AFCAD, for sure.