LightBulb: Sunset time doesn't match

Hello, I’ve noticed that LightBulb sunset time doesn’t match the real one. According to https://www.timeanddate.com/astronomy/czech-republic/plzen sunset time today in my place is 18:11. I have internet sync turned on in LB, it says that today the sunset is at 16:30 and therefore has already started with lowering the temperature. I have version 1.6.3.4 and I’m not sure how long this doesn’t work, but I’m sure it did. Is there anything I could try? TIA.