You need to reinitialize the popovers each time the dataTable is redrawn. $('[data-toggle="popover"]').popover() will only initialize those popovers visible at the time the code is executed, not the popovers in for example page #2. Execute popover() in the drawCallback() callback instead :
$('#datatable4').dataTable({
...
drawCallback: function() {
$('[data-toggle="popover"]').popover();
}
})