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Page Title shown different in Google Search

I have a weird issue: When I google for my NGO AIESEC on mobile phone, Goolgle displays it as “Aiesec”, not as AIESEC. I’ve set up all SEO Titles in the respective pages. But i wonder how to change that. This also happens on some Desktop Results.

Instead of (sorry for the German words)
Soziale Projekte | AIESEC in Deutschland (what I set in the SEO title)
it show Freiwilligenprojekte - Aiesec

I really don’t how to change that.