Approvals - Time Stamp Display Differs Between Users

Hi all, our Finance team has been making good use of the Approvals feature, but we can't figure out why some users are getting the full date / time stamp and others are seeing how long ago the approval was posted instead. They all need to have view of the date / time stamp. I've been trying to figure out why this is happening, but I'm coming up empty. Can anyone shed any light?

My colleague's view - no date / time stamp

Colleague view - no date / time stamp