I had two instances of invoiceninja running for a couple of years (one was v4 and the other is v5).
We finally migrated from v4 to v5 two months ago. We had some issues that we were able to fix and everything seemed to be working great.
But yesterday i learnt that the recurring invoices are sent twice to all customers. The invoice is only generated once as it should be but I don’t know how to start diagnosing why the emails are sent twice (exactly the same email and 30-90 minutes in between the duplicate sending).
We have 4 companies in the v5 instance and only the one we migrated is having this issue.
Do you have any ideas about how i could diagnose the cause for this problem?