Link blocks showing links but not working properly


We want to add a simple grid with clients’ logos and link them to the campaigns they are running. Not sure why but even though I can see the links are there when I click, the links are not working. I have read some other issues with link blocks and I tried already uploading the image first and then nesting it under a link block but it didn’t work. Does anyone know what I’m missing?

Here is my site Read-Only: LINK
(how to share your site Read-Only link)