When viewing a Flow thread, the times of posting for all the comments of that thread appear to have been posted when they have actually been posted ("a day ago", "3 days ago", etc.). However, when adding a new comment to that thread, all the comments suddenly change to appear as though they were posted "45 years ago". This only affects the thread on which the comment was posted on; the other threads on the page remain unaffected. Refreshing the page fixes the problem and causes the times ago to display correctly.
Using Internet Explorer 11 on Windows 8.1.