Problem bucle modal

I think the kind that opens a modal with HTML content:

<a href="#" class="lbp-inline-link-<?php miss $i; ?> ">

and it works fine, but when it comes to number 6 in all cases gives me error. I mean, I work well:

<a href="#" class="lbp-inline-link-1 ">
<a href="#" class="lbp-inline-link-2 ">
<a href="#" class="lbp-inline-link-3 ">
<a href="#" class="lbp-inline-link-4 ">
<a href="#" class="lbp-inline-link-5 ">

but from:

<a href="#" class="lbp-inline-link-6 ">

I open the modal in black, and I can do nothing else on the web until update.

It can be?

thanks

https://www.ads-software.com/plugins/lightbox-plus/