Getting error while after custom object on contact

Content

After making a new contact then adding a custom object which is (Address) on production instance I get an error which I cannot understand 

Please kindly note that we cannot save the address after we filled out the required data and after we click OK it accepts only the (Note) content but for the other fields like (Governorate - City - Region) it was reset and I lost the data I entered

The steps that I did are:

I created a new contact 
and when I try to add a new address from the address tab below and I click OK or Accept I get the mentioned error message.