https://imgur.com/a/6GFDckJ
as in the image there seems to be 2 different kind of recipes for all items, one with the expected amount of inputs and one with different amounts of certain but not all inputs, and some are just plain duplicates.

Are you sure that these two recipes are both ever researched? It seems possible to me that only one of these two costs is ever researched. It is also possible that this special machine that you have is showing both the expensive and the normal mode recipes. I'd love to try and fix this if you can show that these recipes are both available at the same time.

Yeah, whilst working on the aluminium mod issue I quickly verified this. Even in the base game with only this mod you see the same for most other recipes. These are the recipes for other modes, and are thus never researched.

You can verify this by hovering over the recipe in the crafter, pressing CTRL+SHIFT+F and ensuring that the name for one of the duplicates contains the text "expensive" and for the other contains "normal".

okay, this makes editor mode borderline unusable, even with no research or selecting expensive mode both kinds of recipes show.
it seems like this is an issue with expensive mode recipes being a separate or addition to the recipe table and it is planned to be removed anyway (https://forums.factorio.com/viewtopic.php?p=577204#p577204). so idk if their is a simple solution for your mod to disregard expensive recipes but it would greatly improve the usability as of now. ^^

I am indeed going to remove expensive mode handling when the game removes expensive mode. As it makes the code for this mod a lot more complex. But before that, I'm not going to do so. It sucks that the game has bad handling for it in editor mode, but there is nothing I can do about that.