Bug in modul instance? Problems with double block title

[Lindwedler]

I have a problem with a footer identifier, which then displays the module twice over the Module Instance 
(Prestashop 1.7.5, Figure 1) after being amed in the "Block title" (Figure 2) (Figure 3). 
If you remove the identifier, the module label will only be displayed once as desired, 
but with the English default term "YOUR ACCOUNT". As soon as you enter the German name "IHR ACCOUNT", 
he makes again 2 labels out of it, namely "YOUR ACCOUNT" and below "IHR ACCOUNT" (Figure 3). 

Can someone help?

Edited January 11, 2019 by Lindwedler (see edit history)