Page does not exist in 7 web pages out of 100 web pages (Windows, MediaWiki 1.35.2, Apache 2.4.47 Win64 from Xampp, mysql-8.0.23-winx64, PHP 7.4.3)

[userapache123]

I have a Mediawiki page with over 100 links (web pages). Out of that, about 7 of the links (web pages) are highlighted in "red color" and when I hover over those 7 links, I get message (Page does not exist). And indeed no content is found on these pages.

I have imported the database from previous version of wiki (and imported images) and all the other webpages show content but these 7 webpages show "Page Does not exist" and highlighted in red color.

I have the following settings:

$wgMainCacheType = CACHE_NONE;
$wgMemCachedServers = [];

I am using in Windows server:
MediaWiki 1.35.2
Apache 2.4.47 Win64 from Xampp
mysql-8.0.23-winx64 (MySQL :: Download MySQL Community Server)
PHP 7.4.3

I have successfully inported the database, images, ran "update.php" and all the other web pages and images correctly show. The 7 web pages do not have any content and highlighted in red.

can you please suggest what might be the reason?