Zoho changes terms from N30 to Custom even with N30 selected under the company configuration

Zoho changes terms from N30 to Custom even with N30 selected under the company configuration

Hi Zoho Community,

I am having a difficult time with Zoho books as the information I am adding in there is not being reliable.
Our company has some sales in different terms (30,60 and advance) and our contacts they are all classified that way in books. If I look for the company X under contacts, open it and then click "new invoice" it pulls the data correctly, Net 30.  BUT if I I click "new invoice" on dashboard and then find the company under the invoice tab, it SOMETIMES brings the terms as Custom.

I was wondering why is it happening, if it is sort of configuration or is there something triggering it.

Thank you all!