CRM mobile app - near me features do not work properly

I am using ZOHO CRM mobile on iPhone 5 and Android.
Accounts near me - feature does not work either on iPhone nor on Android. I could not yet match a reason why it does not display any accounts nearby. Adress information is completely and identically placed in shipping and billing adress. Pressing the button displays the message both on Android and iPhone: No Accounts found.
Contacts near me - on Android it displays only one of 3 available contacts within the same account which is placed nearby.
On the iPhone displays 3 of 5 available contacts, switching to the contact near me list shows each contact double !
I have set a km range of 50 km on both devices, but it displays only a selection of contacts out of this area.

Maybe this helps to improve the feature.