Hello,
I've looked but not found similar and not sure if this is a virtuemart issue or a template one but anyway, I'm using Joomla! version, 3.4.1 with VirtueMart 3.0.8 and using the istore ii template. It's running locally on MAMP so can't show live site.
When I add related products to a product they don't appear correctly on the product page. See image (http://s4.postimg.org/69olv4dv1/Screen_Shot_2015_05_12_at_09_24_28.png)
What is causing them to appear like this?
It is a problem with your istore template overrides. The template may not have been updated to work with current VM versions. Try renaming the directory templates/[your joomla template]/html/com_virtuemart/ to something different (so the overrides are not used) and the display should work. (or switch to Protostar).
You could use Firebug to see if it is a simple css issue, but really you should ask the template supplier for support, and to provide an update. http://forum.virtuemart.net/index.php?topic=108212.0
Thanks Jenkin,
It is a template issue as it works with Protostar so I am waiting to hear back from them.