Today I noticed that all the phone numbers (Home, Mobile, Office etc.) from my contacts are missing.
All the other information is there e.g. adresses, birthdays etc.
I accessed my contacts on a PC with Windows 8.1 as most of the time.
Update: I realised that the phone numbers are not shown when a person details are shown but if I go to edit mode then they are there. Used with firefox but haven't had time to test other browsers (on the road)