Xperia Z3 :: Contacts Keep Getting Deleted

I tired solution : settings -  apps - all - contacts - force stop - restart... it did not return anything (did not return a contact number)
 
I added contacts from my other phone, manually adding them was a hard job.. since my old phone was a old nokia model (not smartphone) then after a day or 2... I noticed a notification called "SYNC" it said... too many contacts to delete... then i noticed all my contacts deleted...

Then I added some numbers again... but it got deleted again...and I also noticed... some random contacts have appeared on my phonebook, majority of them has pictures..of different nationalities.. and I don't know any of them, and i did not add them too, also... i checked if filter was the case.. the filter settings is fine...