Cloudflare caching does not work for me

Hello community,

my website has been running on Cloudflare in the free version for two years and I was happy with it.
A week ago, my certificate with the provider ionos expired and the website could only be accessed via the Allway online feature of Archive.org.
The certificate has now been renewed and the name servers have been switched back to Cloudflare.
When I do a test at Selesti.com: https://checkforcloudflare.selesti.com/?q=https://www.ballettstudio-ost.de
I get a:
-------------------------------------------------- -------
https://www.ballettstudio-ost.de is using Cloudflare DNS!
Checked 8 global locations, found DNS entries for Cloudflare in 4
Found in: England, Germany, Russia, USA
Not found in: China, Denmark, Spain, Netherlands

https://www.ballettstudio-ost.de is using Cloudflare CDN/Proxy!

https://www.ballettstudio-ost.de is using Cloudflare SSL!
-------------------------------------------------- --------
Now my problem: Cloudflare's caching has stopped working at all and the site is slow.

I think there is something misconfigured in DNS.

A nslookup on www.ballettstudio-ost.de results
Name: www.ballettstudio-ost.de
Addresses: 2001:8d8:100f:f000::260
            217.160.0.11

This is an Ionos IP address and not Cloudflare.
What entries do I need to change to fully run on Cloudflare?
Why doesn't cloudflare cache my pages?

A test on https://www.experte.de/dns-check?d=ballettstudio-ost.de gives the following result:

IP
Type Result TTL
A217.160.0.11 3600
IPv6
Type Result TTL
AAAA 2001:8d8:100f:f000::260 3600

mail server
Type Result TTL
MX 10 mx01.ionos.de. 3600
MX 10 mx00.ionos.de. 3600

name servers
Type Result TTL
NS wesley.ns.cloudflare.com. 21600
NS suzanne.ns.cloudflare.com. 21600

SOA
Type Result TTL
SOA suzanne.ns.cloudflare.com. hostmaster.1and1.com. 2017080902 28800 7200 604800 600 21600

Thank you very much for any help or suggestion!

5 posts were merged into an existing topic: Das Caching von Cloudflare funktioniert bei mir nicht