That explains a lot. I also have a highly overestimated German percentage in my Ancestry report, but the result from MyHeritage is much more accurate.
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This just means that your Polish side is around 30% German-like.
Yeah, I'd say that's probably right? This is what I get from vahaduo using two different medieval calcs:
Target: me:me
Distance: 2.7721% / 0.02772088
71.2 Slavic_medieval
18.6 Germanic_medieval
10.0 Illyro-Roman
0.2 Asian
Target: me:me
Distance: 1.6501% / 0.01650137
74.0 Slavic
14.6 Germanic
11.2 Anatolian
0.2 Illyrian