I found the reason why mywebsite (on rentalserver) can't redraw background image 
Author: SHIMEI N.
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Wen I access my website with no www. URL, the background image can't be redrawed.
But with www.URL, the background image can be redrawed.
My website is,
or
www.simmnex.com is no ploblem.
I think the rental server might have some problem.
Thank you,
Posted on the
Shimei, have you contacted your hosting? Normally the .htaccess file can be modified so that all domain variations are treated equally.