Unexpected Undo (cmd-Z) behaviour

Hello, I have not heard of this before.
Yesterday I needed to Undo a step in Dorico 4. I used the cmd-Z shortcut. Instead of the expected Undo I got something like “Select All”.
This happened three times in a row, I don’t know how? Even repeatedly hitting cmd-Z did not improve the situation, the score was stuck in the Select All mode…

It looks as if you’ve inadvertently changed the keyboard layout to another language layout.

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