Wrong customer reminder Title

Hi Experts

I have in App10 update 15 a wierd behaviour. when i Print the reminder the system somethimes fetches the wrong title. Below you see a invoice which is on level 1 and gets the Titel “Letzte Mahnung”.

if i check the reminder template translation title is should come “Zahlungserinnerung”

but in this case the system fetched for the invoice level 1 the Reminder Title from Level 3

funny thing is that the reminder text is correct though

I also checkt that the customer has defined in the customer data the correct template 1

does anyone has an idea what the issue is?