Date of birth shows everywhere on a single contact page
From Joomla! Documentation
In Joomla 3.4.2 we improved the handling of the Date of birth field.
This pertains only to Joomla! version(s): 3.4.3
What is the cause
If you fill date of birth of a user in profile settings and then show the profile to contact page by connecting a user to a single contact (where the display settings is set Tabs) the date of birth will show everywhere.