What am I doing wrong with this .dck cube?

I built a cube based on wtwlf123's cube. 540 cards. I have the cards in .dck format in the res/cube folder. 'wtwlf123 540 cube'.
The text is like all other .dck files:
[metadata]
Name=wtwlf123 540 cube
[Main]
1 Abbot of Keral Keep|ORI
1 Abrade|HOU
1 Abrupt Decay|MM3
1 Accorder Paladin|MBS
1 Acidic Slime|C18
1 Adanto Vanguard|XLN
1 Aetherling|DGM
1 Ajani Vengeant|DDH
I also added a file to the 'drafts' folder like this:
Name:wtwlf123 540 cube
DeckFile:wtwlf123 540 cube
Singleton:True
Booster: 15 Any
NumPacks: 3
The cube opens and has 15 cards, but they are not the cards in the cube. I don't understand it. I tried restarting, checked the name of the cube, nothing works.
The text is like all other .dck files:
[metadata]
Name=wtwlf123 540 cube
[Main]
1 Abbot of Keral Keep|ORI
1 Abrade|HOU
1 Abrupt Decay|MM3
1 Accorder Paladin|MBS
1 Acidic Slime|C18
1 Adanto Vanguard|XLN
1 Aetherling|DGM
1 Ajani Vengeant|DDH
I also added a file to the 'drafts' folder like this:
Name:wtwlf123 540 cube
DeckFile:wtwlf123 540 cube
Singleton:True
Booster: 15 Any
NumPacks: 3
The cube opens and has 15 cards, but they are not the cards in the cube. I don't understand it. I tried restarting, checked the name of the cube, nothing works.