Strange e-Newsletter update

Today I've got a notification from y WordPress dashboard, saying that there is an update for e-Newsletter plugin.

In the update-core.php page I see this: https://skitch.com/andrea.sciamanna/8mktt/aggiornamenti-di-wordpress-progettoanike-wordpress

Trying to see the details of the update (something I always do) I get this: https://skitch.com/andrea.sciamanna/8mkt2/aggiornamenti-di-wordpress-progettoanike-wordpress

Obviously, this it not related to e-Newsletter (the plugin home page points to http://partexto.com/).

If I do the same from the usual plugins page, I get the right details instead.

So, what I'm trying to understand is if my site has been hacked or there is something wrong from your side?