Some shows that had English translated versions of their OP/ED kept the original instead even when using the English audio otherwise (that's generally the right decision as song localization is hard to do well and for the most part these were awkward) So I get to wonder if current rights holders just didn't get the English song rights and couldn't use those, or if someone looked at both and made a choice to roll that back.
And then there are the shows that were never intended to fill a wide screen television so they zoomed in on the middle of something with hard titles so you can't read the first half of every episode title and most but not quite all of the song lyrics have fallen off the bottom of the screen.