Pihole on thinclient blocks internet for one device edven if blocking disabled

I installed pihole in a docker on alpine linux on a thin client. My problem is that internet traffic is blocked on a linux-mint device ( in general on mobile devices not but on the smart TV just for amazon but not for netflix. And also not blocked for my Ubuntu-client (but that works with a VPN).
My debug-token is: https://tricorder.pi-hole.net/JX6dg1Pb/

Many thanks in advance! ^^

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