On different screen or when we zoom out the page on a particular parentage it is not matching their respective time cell time.
http://headsocial.com:8080/upload/152603941356615901ce040c290cf35b2df22e69685f.png
I'm not able to reproduce the problem in any major browser (Chrome, Firefox, IE, Edge).
You might be using a custom CSS theme that prevents proper scaling.
It is also on live demo section. You can see in screen shot given below. http://headsocial.com:8080/upload/15265438166575a532e06fc797a3d4f34fff871450e2.png