Why would Bob Dylan misquote his own lyrics?

The penultimate verse of Isis on the LP version (as MetroLyrics confirms) are clearly audible as follows:

She said "Where ya been?", I said "No place special"
She said "You look different", I said "Well, I guess"
She said "You been gone", I said "That's only natural"
She said "You gonna stay?", I said "If you want me to, yes"

I Binged this a couple of days ago because I wanted to pin down some lyrics that are mumbled (what I thought was "the borderline" is actually "dividing line", not that it makes any difference) and was surprised to see that Bob Dylan's official site gives the penultimate verse as:

She said “Where ya been?”, I said “No place special”
She said “You look different”, I said “Well, not quite”
She said “You been gone”, I said “That’s only natural”
She said “You gonna stay?”, I said “Yeah, I jes' might”

This might be some bizarre copyright wrangle, where Bob Dylan doesn't have to hand over a share of the royalties if he publishes his own version of a song which he co-wrote, but FFS.