Consider updating your theme to the latest version. See the changelog.
https://theme-fusion.com/avada-documentation/changelog.txt
If that doesn’t fix it, you can use this custom css to fix the appearance:
.related {clear:both}
or this to hide the related products:
.related {display:none}
If your theme does not have a setting where you can enter custom css, you can use a plugin like this one:
https://wordpress.org/plugins/simple-custom-css/