Why are the song dates in the song category different from the song upload dates on your YouTube channel?
generally i consider the song date and music video release date to be the same, but in rare cases it differs so drastically that it would simply be a lie to claim the song was made when the video was made. However, most of the time, they are close enough that i use the final video release date as the song's date on the song page. so the majority of them should indeed be the same. the only recent difference i can think of is "i'm a princess" where the song was entirely audio-locked by april 2019 but the video wasn't completed until 2021