Hello,
There are two options that can cause this:
"Number duplicate product names" in VirtueMart extension parameters - this is used when you have multiple products with the same title present, so each of them has different SEF URL, so they are all accessible.
"Number duplicate URLs" either in global JoomSEF configuration or in every extension parameters - this option can be used, when there are problems with the same SEF URLs being generated for different pages. With this option enabled, the SEF URLs are numbered, so all the pages are accessible.
There were no change made to these options in last updates. The "Number duplicate product names" is enabled by default and "Number duplicate URLs" is disabled by default.
Best regards,
ARTIO Support Team