Yes, this is a known anomaly in the administrative area hierarchy in Slovenia.

Upravna enota Litija contains 3 municipalities:

  • Litija
  • Šmartno pri Litiji
  • Ivančna Gorica

https://www.gov.si/drzavni-organi/upravne-enote/litija/o-upravni-enoti-litija/obcine-in-naselja-upravne-enota-litija/

Yet
https://en.wikipedia.org/wiki/Central_Sava_Statistical_Region
Contains Litija municipality

And
https://en.wikipedia.org/wiki/Central_Slovenia_Statistical_Region
Contains the other two municipalities

Thanks for keeping a sharp eye on our government :wink: