[MichaelNRW]

First, do NOT buy anything from bimmerplug.
They´re just dropshipping cheap chinese parts that you can buy yourself on Ali Express.

Second, the DRL modules in each headlight are directly connected.
If one module fails, the other gets harmed as well.
So you always need to replace both modules to be sure you wont destroy another module.
It seems to be an error with the latest units, that the turn signals are permanently on.
Get in touch with bimmerplug and let them replace the units until you receive some that don´t have the turn signal permanently on.