Banking.postbank.de/rai/login is not working

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nslookup pi-hole.net

Server: 127.0.0.1
Address: 127.0.0.1#53

Non-authoritative answer:
Name: pi-hole.net
Address: 206.189.252.21

nslookup flurry.com

Server: 127.0.0.1
Address: 127.0.0.1#53

Name: flurry.com
Address: 0.0.0.0

I'm using 1.1.1.1 as DNS service for a while now and it worked well so far.
/e: it was working well with postbank.de too :>

/etc/resolve.conf content:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
# DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 127.0.0.1