Hi,
UPDATE 1: (disregard my previous response)
I just tested it this on my localhost, and experienced the same problem with official Virtuemart layout as well (without CleanMart).
Once the next page is clicked, there is no way to get back to previous page.
You can also try this on your website. To disable CleanMart temporary from your website, connect your website via FTP; find this folder:
/templates/YOUR_TEMPLATE/html/com_virtuemart/
rename this folder to this:
/templates/YOUR_TEMPLATE/html/com_virtuemart2/
- visit any category page, you will notice you are now using the official Virtuemart layout.
- you will notice the pagination is problematic in official virtuemart layout as well.
This problem doesn't happen when SEF URL is disabled through Joomla Global Configuration, so it is definitely related to SEF URLs.
UPDATE 2:
I found this topic:
forum.virtuemart.net/index.php?topic=127793.0
Jjenkinhill says (who is a Global Moderator):
As stated many times here, pagination is broken in Joomla 3.3.6 - testing with alpha/beta Joomla 3.4 shows it is repaired fpor that version.
So, the problem is actually related to Joomla3.3.6. Looks like updating the Joomla is fixing the pagination problem. For more info, see the virtuemart forum thread
Regards.