Facebook share improper URL format

On THIS page, which is part of a WordPress based website, I have a collection of mp3 files, each with a Facebook share button. Shearing the page works only if prior to clicking the button, I have already logged in.

Otherwise, if I first click the button and then (after being asked to) I log in, the URL to share is badly formatted and the posts picture does not apear:

https://www.facebook.com/login.php?next=https%3A%2F%2Fwww.facebook.com%2Fsharer.php%3Fu&display=popup

Why is that? Any hints on how to fix the problem?

Thank you!

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