You’re actually using a really old version of Alyeska that’s long past being supported any more. I feel like we’ve talked about this at some point, but can’t remember. Anyway, you’re truly going to continue to have problems moving forward with this version. So, I’d think about grabbing the latest version at some point in the future and having a look at the documentation that comes with the new version.
In this case, there’s no feature in the old version of the theme (I don’t think) that would allow someone to put anything where you have that broken image. I’d say most likely the old person working on the site manually hardcoded the image in footer.php of the theme? Maybe you can start there.