Why does sonic sound a bit off key to me at the start

Friday Night Funkin - Corruption [Dead Pixel] - (Evil Boyfriend vs Senpai) (Part 2)

Link to Game Audio https://gamebanana.com/mods/324736

Yea no Covers are Made by Me at All

QT KB Robot Sings Endless (FNF Endless But It's An KB Robot VS Majin Sonic Cover)

Enjoy! And please stop by the Killergalaxy 2.0 YouTube channel before commenting on a possible error. ^_^