Odd, this just started happening on a staging site.
I have a collection list and the link blocks are set to “current product”.
This was working fine until a couple days ago. Now, when you click the link – it goes to the homepage.
YET, when you hover over the link, it shows the url path it’s supposed to go to!
If you goto this page though, you’ll see the collection list and click on any item and you’ll see… Also, hover over the item and see the URL that previews in the browser…
EDIT 2: Also, if you view this in the designer – the links work FINE… it’s only on the live sites…
EDIT: Here’s a video also showing what’s happening: