It has been doing this for 2 years or more. It seems to happen more with DHL in Germany & the Netherlands, but also with POSTNL in the Netherlands.
It has been reported numerous times during the 2 years or more, but many of us found a way around it ourselves to prevent issues with tracking, by just checking the orders within 24 hours from dispatch to make sure they had not automatically switched to another carrier. For the orders which do switch, edit and put in the right carrier name.
I have never known it to automatically switch a 2nd time on a order.
