The curse of the Hallow one has gotten to you my dear friend, there is nothing we can do..

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░█████╗ ██╔══██╗ ╚═╝███╔╝ ╚══╝ ██╗ ╚═╝

Well its because someone is using the same username. That reason, it's won't saving. That's why i don't change my username because someone can steal the username and not change it.

Well, I know how to fix it. So you see it's not saving, turn off your internet and after turn it on and press the button at the top left corner and press save changes. If it doesn't works do it 2-3 times

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