1 hour differences facr and Isha times in Switzerland according to Turkiye Diyanet

[xyzbilal]

Hello Dear Brother,
Thank you very much for your effort and made us create benefical app with easy way. This is not an issue but maybe I cant understand the calculation exactly. I will appriciate if you give me any idea.

The issue is a user from Switzerland reports me that facr and isha times have 1 hour in diyanet mobile app and in my app
I believe it is about calculation parameters but I could not determine which parameter can cause it. its perfectly fine in Turkiye cities but this occurs only Switzerland. I tried to change highLatitudeRule but it provide me not exact result, which parameters else I should consider to change.

regards.