Before I started, I told the developer of WordPress plugin alphabetic pagination, “I am little weak in English.” I told him that I did not understand how the plugin was worked. I send him the link of website and told him that I want achieve the functionality exactly like that website: http://www.mediadigest.be/mediaterminologie/
He asked me for website credentials through contact form to review my query and rectify the problem. He informed me most probably website theme was not using main query because plugin alphabetic pagination alter main query and everything worked fine. He asked me to inform him that could I inspect that by myself or he can do that for me.
I informed him that it was not a single website so I cannot give you the access to website. I also told him that I can inspect that by myself.
He asked me for theme files of website which was associated to the required view. He told me that he would immediately inform me that what was the problem and how can that be resolved.
I informed him that I could not send him .zip file of theme there. He gave me the link of his website: http://www.websitedesignwebsitedevelopment.com/contact
He provided me his Skype address too. And told me he came to online to resolve such problems at 10PM (GMT+5).