Rare behaviour deleting row showed in datatables (bug report?)

Hello, I have a strange behaviour with a table with datatables.
I listed all my records in datatables with pagination and filters. In each column there is a link to delete this row like this

<a href="{{ path('alumno_borrar', { 'id': alumno.id})}}" data-confirm="Are you sure?"  rel="tooltip" data-original-title="Delete Alumno"><i class="icon-remove"></i></a>

If if press this link it appears a confirm dialog box to delete this row. It works correctly, but only in the first page. If I am in other different pagination page to the first, the confirm dialog box doesn´t appear.

Any clue or help? do you think it could be a bug?

Thanks in advance