Templates and mailtemplates don't work

Templates and mailtemplates don't work

Dear team,

I attached templates to my contacts and email notifications to my products. So everything was ready to go.
This morning all invoices where sent out and they all used the same template and the same email notifications.

This means that allot of wrong invoices where sent this morning. How is this possible?
I double checked the setting but they all look fine. 

So: The pdf templates where all wrong and the mail templates where all wrong. I don't understand how this is possible.
I tested it before sending the invoices and than it just worked fine. 

I use Zoho Subscriptions together with Zoho Books

Looking forward to your response,

Dirk