The Sun sets (zero horizon) at the wrong time!

Setting the location to Makkah - KSA, on 25/09/1908, the sun upper limp crossess the horizon at 5:48 PM! While sunset is at 6:21 PM!!! This is a difference of approximately 33 minutes, which cannot be explained by time zone or refraction. I am confused because it gives correct results for today's sunset. Am I doing something wrong! 🤔 This is true on both SkySafari pro 7 & 8 on Android.