Calendar bug

Hi

I find a frequent bug in iOS Calendar. Many times I do the following steps and find the bug:

Open Calendar > swipe bottom to top to see next month events > swipe too to bottom to come back actual month. At this moment if there is an event at the 1st day of the month, in instead of backing to the actual month (November) it colapses the days and shows only the event of this day (1st December). If I click upper left “déc 2017” to see the month view, it jumps to January 2001.

This happens quite frequent and in different devices. Bellow you find the iPhones and iOS I found it and some screenshots to ilustrate.

Does anyone had this as well?

iPhone 8 iOS 11.1.1

iPhone 5 iOS 10.3.3

IPhone 7 iOS 10.3.3