In the bottom of this menu you can see below "Reset Statistics"an information called "Last Reset:".
Your "Current Period"is based in your last reset. System is counting data use since from this last reset.
Isn't normal to Calendar/Contacts use all this data, for a week for example, or a month... but if you never reseted the statistics, in the first sync from your phone and calendar app, it's possible to consume much data with Contacts Image, integrated Calendars, informations attached.
Please check if do you have any kind of integration on this apps and your last reset to conclude it's using much data.