It's not clear if with "SODE jetways" you mean SODE jetways that came with a scenery, or SODE jetways which comes with GSX that have been automatically replaced by GSX.
If they are not GSX-created SODE jetways, perhaps you have a SODE XML file in the C:\ProgramData\12bpilot\SODE\XML folder which came with a scenery you installed and removed, so they mix up.
And, it's very strange you say you see "default" sceneries mixed with SODE jetways only on THIS airport, considering you said default jetways have been disabled everywhere else. It's not possible to selectively disable default jetways, because they use only *one* model.
If that model is disabled, and it surely is, otherwise you would see double jetways everywhere, there's no way it can appear anywhere.
So, the only possible explanation is that you have another scenery in conflict for that airport, which uses jetways that looks like the default ones, but they aren't.