I ran into this same problem… I’m making my own theme, but until its done I’m using the classic theme.
I can’t be bother to figure out what the php actually means, but to fix it, just go into the theme editor, open up index.php, scroll down to the bottom and replace
this:
<?php posts_nav_link(‘ — ‘, __(‘« Older Posts’), __(‘Newer Posts »’)); ?>
with this:
<?php posts_nav_link(‘ — ‘, __(‘« Newer Posts’), __(‘Older Posts »’)); ?>