numbering lines

Hi,

I would like to refer to specific lines in a poem as in this example (the page is in Dutch, please scroll to the bottom).

For some reason, in the Wordpress version of the same page, I can't get it right using the Word paste button in the wysiwyg editor. The numbering is off - please see the result here (again, please scroll down a bit).

As always, your help is much appreciated.

Thanks,

Rutger