i am also having this issue. i have noticed that it seems like only the engines configured by AJE extended are being affected in this way, when not using real fuels. still trying to track down exactly what is going on, AJE extended uses mm templates for patching the fuel types of the engines, the module manager cache shows the templates being loaded, but for some reason not applied (the engines still end up with liquid hydrogen when it should be LF (no real fuels installed).