When I set the EHAM gateways to DISABLE, I get the ASOBO default gateways. (screen shots 1 and 2)
That's exactly what you are supposed to get.
When the EHAM gateways are on ENABLE, I get the GSXPRO gateways but misplaced in relation to the buildings. (screen shots 3 and 4)
That's normal, because the jetway replacement files included are only meant to be used with default airports.
The enhanced EHAM, even if it was made by Asobo, cannot be considered a default airport, because it's not included in all MSFS versions and because of this is Encrypted, meaning we couldn't possibly create a Jetway replacement file for it, so the jetway replacement file that comes with GSX is based on gates and positions of the standard airport, the non-enhanced version that comes with all versions of the sim.