TWR 1539,5 ?

Today at 1830 UTC I was able to follow the start of a TWR transmission on 1539.45 kHz here in Salzburg. At the start of the programme the well-known TWR IS was played, also at 18.45 UT. The programme could be heard until 19 UT. What is being mixed together here?

Christoph Ratzer (2022-08-20)