I have a multisite with one site in particular that is showing the wrong gravatar for it's user. A client of mine writes the blog while I handle the tech stuff, so we both have accounts on the website. When he comments on one of his own posts, his gravatar doesn't up. Mine shows up instead.
His gravatar works fine everywhere except the comment section. I've confirmed that his correct email address is associated with each of this comments, but my gravatar is still showing up in place of his.
I've tried deleting my profile, but that doesn't fix it. I've disabled all plugins, and I've reverted back to 2012 default theme. Nothing seems to fix it. For some reason, the site is pulling the gravatar for the network admin (me), not the gravatar associated with the person actually commenting.
This isn't happening on any other site in the network. It's an isolated event as far as I've seen so far. Since I've ruled out the plugins and the theme, it's gotta be WordPress files, correct? I've also recently optimized the db, so I'm honestly not sure what to check next. Any insight is much appreciated!