Você cometeu o mesmo erro que Harry em Harry Potter e o Enigma do Príncipe . Como JAD disse , Voldemort queria dividir sua alma em sete, não criar sete Horcruxes (ênfase minha):
“[...] You heard him, Harry: ‘Wouldn’t it be better, make you stronger, to have your soul in more pieces... isn’t seven the most powerfully magical number...’ Isn’t seven the most powerfully magical number. Yes, I think the idea of a seven-part soul would greatly appeal to Lord Voldemort.”
“He made seven Horcruxes?” said Harry, horror-struck, while several of the portraits on the walls made similar noises of shock mid outrage. “But they could be anywhere in the world — hidden — buried or invisible —”
“I am glad to see you appreciate the magnitude of the problem,” said Dumbledore calmly. “But firstly, no, Harry, not seven Horcruxes: six. The seventh part of his soul, however maimed, resides inside his regenerated body. [...]”