Please make the below change and see if issue persists.
IN: components/com_comprofiler/plugin/user/plug_cbcore/cb.core.php
FROM:
Code:
$allowed = array( 'audio/mp4', 'audio/mpeg', 'audio/ogg', 'audio/wav', 'audio/webm' );
TO:
Code:
$allowed = array( 'audio/mp3', 'audio/mpeg', 'audio/ogg', 'audio/wav', 'audio/webm' );
We've already a ticket to fix/improve this validation to be more accurate like CB Gallery usage.