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Questions

Does GA parameter influence Hreflang tags setup and SEO score?

Your hreflang markup looks correct. As far as the _ga query string parameter is concerned, what you want is for Google to ignore it. For that you can use canonical tags. So make sure https://example.de/?_ga=1.16730294.1000579032.1461248919 has the following markup in the HTML :
Technical SEO Issues | | NickJasuja

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