Changes made to a contact on mobile are synced back to CRM

Hi,

We are  using filters to synchronise CRM contacts with  Outlook/Exchange. What we find out -  if contact gets updated on mobile (IOS or Android), changes are propagated to CRM, which doesn't happened if contact gets updated in Outlook. Only one way synchronisation CRM->Oultook is configured.

Looks like a bug.

Does anybody know how to stop it from being syncing from mobile to CRM?

Thanks!