Hi,
I am sorry but I don't think that it's a problem of HikaShop. It appends only with new sessions.
You have a plugin or something which make a css cache file.
Well, the first call to the website, there is no CSS files in the JDocument (Joomla, not HikaShop).
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-us" lang="en-us" >
<head><meta name="robots" content="noindex">
<base href="http://waughhd.com/parts/parts-promotions-menu/product/1413-sundowner-deep-bucket-seat-road-king-classic-basketweave.html" />
<meta http-equiv="content-type" content="text/html; charset=utf-8" />
<meta name="keywords" content="Sundowner™ Deep Bucket Seat - Road King® Classic Basketweave" />
<meta name="rights" content="All Rights Reserved." />
<meta name="description" content="Sundowner™ Deep Bucket Seat - Road King® Classic Basketweave" />
<meta name="generator" content="Joomla! - Open Source Content Management" />
<title>Sundowner™ Deep Bucket Seat - Road King® Classic Basketweave</title>
<link rel="stylesheet" type="text/css" href="http://waughhd.com/cache/css-029485470e8842f7be0574432e8fe342.css" />
As you can see, there is a link to :
waughhd.com/cache/css-029485470e8842f7be0574432e8fe342.css
The first time the file is loaded, there is an error. Google Chrome make some asynchronous calls so I think that the file was not accessible the first time.
Regards,