It seems you resolved your other issue but I will add this for others.
In the bottom right of your mods menu is the path "user://mods/Leo/", this should be "user://mods/". You need to press the button for the path and use the black arrow at the top of the folder dialogue to go up a folder.
As a result of this bad path, a duplicate of the Constants mod was created inside the Leo's mod folder. It's best to delete that duplicate after changing the path in game, though it should usually be harmless.