It seems Gregtech manages to infuriate me even when turned off! So the server has Gregtech disabled but NEI still shows some Gregtech recipe like the Advanced Solar Panel but others like the Macerator or basic Solar Panel are fine, what's up with that?
The wiki is wrong. Advanced Solar Panels handles its own recipes. GregTech only affects the base Solar Panel recipe (which has a knock-on effect on the other recipes but that's another matter entirely).