Zoho Invoice: iOS App - Payment Terms selection issue

Zoho Invoice: iOS App - Payment Terms selection issue

While using the iPhone app to generate invoices I'm unable to select the desired payment terms (eg. NET 30) from the settings prompt.  Invoice will always default to "due on date specified".  Various terms options can be created and will appear in settings menu, but I can not actually select it. 
I'm only experiencing this with the app version, desktop is ok. Any resolution to this or just a bug that needs fixing? Thanks in advance!