The movie aired originally only with the Title Der rote Kreis the other one is added as alternative title

What is the difference between this film and the rest of the series? All the others were also named on TMDB according to the "Edgar Wallace - ..." scheme, although the original titles are always just e.g. "Der Frosch mit der Maske". At least that's what Filmportal, Filmdienst and Wikipedia say.

Shouldn't all titles here have the "Edgar Wallace - ..." addition removed?

this must be decided on a case-by-case basis you have to look at every film as it was called when it was first shown

Okay, I haven't looked through all of them, but as an example, one could look at "Die Tote aus der Themse".

https://www.filmportal.de/film/die-tote-aus-der-themse_693c1522edb8430c90612991df324408

https://de.wikipedia.org/wiki/Die_Tote_aus_der_Themse

https://www.filmdienst.de/film/details/22104/die-tote-aus-der-themse

https://web.archive.org/web/20080203231317/http://www.deutscher-tonfilm.de/dtadt1.html

Is that enough? As far as I know, that's the case with all the films in this series....

I have no time to investigate all films now but if you think there are more films where the title is wrong please file a report for each film and a moderator will take care of it