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May be silly question, but: Lost my qq(´) and qq(´) key

Hi list,

since a few days, my qq(´) and qq(´)¹ don't work with a single press. I have to press twice.
Who can tell me why?
And, ho do I get my old single press behavior back?
Sorry I don't get this keyboard magic in this life...

1) On a German keyboard, it is the key left of the backspace.

Thanks, Martin