I am seeing the same thing, in USD but not CAD, accessing from Canada.
On the /product page M3's are 897 USD/pr and M5HP's are 1620 USD/pr.
On the individual pages eg /m3-bookshelf-speakers M3's are 598 USD/pr and M5HP's are 1080 USD/pr.
When I first looked at the prices (CAD / Canada) the /product page prices matched the /<individual product page> price.
When I selected USD the site also flipped from "Canada" to "United States" - I was able to set country back to Canada while keeping USD and the prices were still wrong on the top level products page, so currency seems to make the difference rather than location.
I also went back to CAD and confirmed that prices once again matched between top level and individual product pages.
I have submitted an IT ticket to Axiom and referenced this sequence of posts, although I mis-typed 44073 instead of 440073 for Sophie's first post
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