Pages missing from Dashboard and are without theme

I have just began work on a website qmctx.com. Only the homepage and contact page work properly with the theme and pictures. The problem is with the affiliate page links found on the homepage (water well services, macy’s rentals, etc…). These pages are not showing up within the WP Dashboard yet are still live, just missing the theme and pictures.

I did some digging through some files and found the issue to point towards the hrefs generated by the php code in various files of the broken pages such as this line of code from a header template for the water well services page:
<link rel="stylesheet" type="text/css" href="<?php echo get_stylesheet_uri(); ?>" />

The HTML results of this code is:
<link rel="stylesheet" type="text/css" href="http://www.qmctx.com/water-well-service/wp-content/themes/quintanilla/style.css" />

While the proper HTML code that makes everything functional is:
<link rel="stylesheet" type="text/css" href="http://www.qmctx.com/wp-content/themes/quintanilla/style.css" />

I am fine with making edits through FTP, so the dashboard issue is not too pressing.