Apparently, the root cause of the issue was the client was using a URL-masking forwarding method to point to a sub-domain.
For example, consider if the client were to already have a domain/website at:
www.webuyboats.com
And they wanted to host all of the files encompassing an entirely different website that you designed for them on a subdomain, such as:
collegeadvice.webuyboats.com
But they purchased the domain:
www.collegeadvice.com
And when people navigate to the above domain it just "points" the browser to the files hosted at the subdomain with a URL-masking, it distorts the aspect ratio used by jQuery mobile. In order to correct this, the files need to co-exist with the domain or URL-masking needs to be turned off.