This is not a in-Game bug the this is a Bug in the login screen

my region is EUW and sometimes when im starting the client in the Login screen it trasfers me to NA and it Forces me to do the whole game patch its like its my first time downloading league and playing league it just Teleports me to NA how and i didint even change regions it changes alone HOW ?? its not the first time happening to me not second and not third it happend to me alot of times
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