There's something wrong with The Magnificent Twisted Fate's value in Hextech Crafting.
TMTF is treated as a Legendary Skin (and also branded as Legacy) in Hextech Crafting - however, TMTF is one of the older Legendary skins with no changes in particle effects, animations or voiceover. It's essentially worth 975RP rather than the 1820RP value it's given in Hextech Crafting - and the Orange Essence upgrade/disenchant values correspond with it's Legendary status.
I spend about 1500 Orange Essence upgrading the skin, when in reality, if you look at Riot's pricing guidance/RP value concerning skins and the effects, it's only worth 975RP at the most, and realistically 750RP.
Riot have said in the past that they don't plan on updating these older Legendary Legacy skins, but they have said that if they return to the game at any point their value will be adjusted accordingly. This has not been done in Hextech Crafting - instead, we have skins worth 450 to 675 Orange Essence being treated as if they are worth 1520 Orange Essence.
If the skins aren't going to be updated, at least update their Hextech Crafting value to suit their quality by "modern" standards.