Random language - order confirmation

Hello
I am only using two languages in my store using localize with the shopify app; translate & adapt.

However during a test order we noticed that the customer notifications come in a random language. We don’t even know what language this is. See pics:

Furthermore, this seems to only happen in the first three order notifications on the list, the order confirmation, order edited and order invoice.

I have multiple stores and this is the only one where this has happened.

Any ideas?