All the links in the journal open the same article after installing the plugin popularArticles

Hi! We are using OJS 2.3.8 running more than 20 journals. And we’re not authorized to install a newer version of OJS until next year.
Installed this Plugin:
=== OJS Popular Articles Block Plugin
=== Version: 1.0
=== Author: Juan Pablo Alperin

And after upgrading OJS everything seemed to be OK, but we discovered that every article title links to the same article: the last most visited article in the list generated by the plugin.

Any ideas, please??
Thanks in advance