How can I stop getting the international symbols when I type? Parameters are set on U.S.

If I leave my iMac for more than an hour and then start to type, for each character, as I type, I get a box showing international characters.
I use a bluetooth keyboard, and this problem started when Apple replaced my hard drive - never before that.

Whenever it happens that I have to do a hard reboot.

My keyboard settings are of the U.S..

I should add that this does not happen all the time, maybe 60% of the time.

Tags: Mac

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