The Last Updated column seems to be... odd

Context: Just updated from 9.1.2 to the latest release.

The “Last Updated” column is measured in months. However, the commits recorded in the repo are inconsistent with that.

Here’s a sample of the offending repo: http://prntscr.com/fe3o7y

Now, here’s one of the commits on said repo: http://prntscr.com/fe3olr

I’m not sure what caused this.