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:

Trying to see the details of the update (something I always do) I get this:

Obviously, this it not related to e-Newsletter (the plugin home page points to

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?