How can I solve "double type problem"?

I have a big problem related to my keyboard. when I push a character, more than one character is shown. For example, when I type "how are you" a bit fast, the result is; "howw arre yoouu".

Am I the only one having the problem? If you have any solution, please share it with me.

I changed my keyboard to google one, swiftkey, and so on, but it didn't work.

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