[SOLVED] %date-modified% shows same as %date%

Hello,

I'm not sure why this is happening: %date-modified()% shows the same date as %date()%.

I have Atahualpa 3.7.3. In the template options, under Edit post/page info items, I have this for the three byline fields:

<image(user.gif)> %author%&nbsp;&nbsp;&nbsp;&nbsp;<image(date.gif)> %date('j F Y')%(modifi&eacute; le %date-modified('j F Y')%)&nbsp;&nbsp;&nbsp;&nbsp;<image(comment.gif)> %comments('Commenter', '1 commentaire', '% commentaires', 'dontshow')% %edit('&nbsp;&nbsp;&nbsp;', 'Editer', '')%

I added the date-modified part this morning. (P.S.: I know the repetition of &nbsp; isn't great, but I haven't had time to think of a better solution.)
This works, as in all images and fields are printed out in the byline of each post, but the modified date is the same as the publication date for all posts.

I saw another thread on this (from ~2009), that suggested there was a bug in bfa_postinfo.php. I had a look the code, it seems fine to me.

Any idea of what is going on? Is this even a problem with the theme?

dcclxi