mouse speed

Hello everyone,every time i start the game my mouse speed change.I don't know any other game everything is fine.I didn't make any changes in setting.It's really difficult for my hand to play.I tried to change the mouse speed in the game but i can't really catch that right speed.I'm currently on 1600 dpi mouse. [here is my mouse settings in windows]( [and here is LoL settings how it is in default i hope ]( Someone had the same problem ? Any advice or tips ? Thank you
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