A Wochenspruch Mystery

There are something over 500 examples of the Wochenspruch der NSDAP on the German Propaganda Archive.  It was a weekly poster with inspiring quotations that was displayed in prominent public places throughout Germany.

They were first issued in 1937 (I think), some coming from the individual Gaue, others from the Reichspropagandaleitung in Munich.  This situation continued until early in 1939, when all issues came from Munich — with the exception of Gau Sachsen, which continued to issue its own well into 1941.  I just bought the latest one I’ve seen, dated 6-12 April 1941.

I am curious as to why Gau Sachsen kept producing its own two years longer than anyone else.  Should anyone uncover the reason I’d be delighted to hear it.