By default, since Avada 5.1, the the full image rollover area in post and portfolio slidershows is linking to the single post page. If you want to remove that, so that only the rollover link icon links to the single post page, you only have to add a single line of custom CSS to Theme Options > Custom CSS:
.fusion-rollover .fusion-link-wrapper { pointer-events: none; }
Or you may have to use something specific like this…
.fusion-columns-3 { pointer-events: none; }