Series incorrectly placed under Soulmates: The Series

Since a few weeks random episodes are added under the series Soulmates: The Series. I’ve never had this serie and also do not have any folders with this name.

An example of the structure is as follows:

Code:
Series
  - Superior Donuts
    - Season 1
      - S01E01 - Pilot.mkv
      - S01E02 - What's the Big Idea.mkv
  - The Blacklist
    - Season 04
      - S04E17 - Requiem.mkv

The last episode of The Blacklist is added in the library under The Blacklist, however the episodes of Superior Donuts are all added under Soulmates: The Series. Also episodes from Grey’s Anatomy which were previously correctly added under the correct series are now added under Soulmates.

In the tvshow.nfo file the following information is available:

Code:
<tvshow>
  <title>Superior Donuts</title>
  <rating>8.3</rating>
  <year>2017</year>
  <plot>Based on the play by Tracy Letts, Superior Donuts, chronicles the relationship between the gruff owner of a small donut shop, his enterprising new young employee and their loyal patrons, in a quickly gentrifying Chicago neighborhood.</plot>
  <episodeguide>
    <url>http://thetvdb.com/api/9DAF49C96CBF8DAC/series/321219/all/en.zip</url>
  </episodeguide>
  <episodeguideurl>http://thetvdb.com/api/9DAF49C96CBF8DAC/series/321219/all/en.zip</episodeguideurl>
  <mpaa />
  <id>321219</id>
  <genre>Comedy</genre>
...

Also, the nfo files accompanying the episodes contain the correct information as far as I can see.

Does anyone have an idea what could be the problem?