This is not a critical issue, but for a number of weeks, I've had one subsite (in a subdomain install) that shows that one plug-in update is needed in the gray admin bar at the top of the page. When I try to click through to update this plug-in, it takes me to the network admin updates page, which shows that no updates are needed. No update notices are showing on any other sites or the network admin dash.
I'm pretty meticulous about keeping everything updated, so I'm pretty sure there's not a needed update. But I can't get that update notice to disappear from the one subsite.
Anyone know why this might be happening? And/or how to get that phantom update notice to disappear?