I remember when I first installed Steam after formatting my PC I went to the download settings and chose Germany Frankfurt instead of Israel (Since the download speed is higher of course) but now after reading your post I went to the settings and found out it is back to Israel.
It seems after each update it will reset to the nearest server and you will have to amend this manually.
It seems after each update it will reset to the nearest server and you will have to amend this manually.