Pihole stopped resolving some websites

Expected Behaviour:

Hello, i have installed since 6 months Pihole on a VM on google cloud platform.
I'm using Wiregard to connect to this interface with Cloudflared installed to connect to DOH
I m using UBUNTU 20.04.03 LTS
Connection from macbook pro and iPhone

Actual Behaviour:

Since i believe maybe 1 or 2 weeks i'm experiencing "unable to connect" on some websites.
I m able to contact those websites when i'm not connected to my Pihole. (ie : nouvelles.fr was not working via Pihole since 2 days and this morning it was working.) But only on my computer (macbook pro) and not via my iPhone ...
When i'm connected to my VM in SSH i can ping the website that i can't connect from my computer and the ping is very good (between 1 to 7ms)
I disabled all blocklist / flush / restart DNS and nothing.
Some time after this website is working without doing anything ...

I checked that clouflared is up to date and Wireguard as well

additionnel datas : status of cloud flared :

*sudo systemctl status cloudflared*
*sudo: unable to resolve host pi-hole: Name or service not known*
*● cloudflared.service - Argo Tunnel*
*     Loaded: loaded (/etc/systemd/system/cloudflared.service; enabled; vendor preset: enabled)*
*     Active: active (running) since Fri 2021-09-10 09:17:36 UTC; 5s ago*
*   Main PID: 1010 (cloudflared)*
*      Tasks: 7 (limit: 1159)*
*     Memory: 7.4M*
*     CGroup: /system.slice/cloudflared.service*
*             └─1010 /usr/local/bin/cloudflared --config /etc/cloudflared/config.yml --no-autoupdate --origincert /etc/cloudflared/cert.pem*
*Sep 10 09:17:36 pi-hole systemd[1]: Starting Argo Tunnel...*
*Sep 10 09:17:36 pi-hole cloudflared[1010]: 2021-09-10T09:17:36Z INF Version 2021.8.7*
*Sep 10 09:17:36 pi-hole cloudflared[1010]: 2021-09-10T09:17:36Z INF GOOS: linux, GOVersion: devel +a84af465cb Mon Aug 9 10:31:00 2021 -0700, GoArch: amd64*
*Sep 10 09:17:36 pi-hole cloudflared[1010]: 2021-09-10T09:17:36Z INF Settings: map[config:/etc/cloudflared/config.yml no-autoupdate:true origincert:/etc/cloudflared/*
*cert.pem proxy-dns:true proxy-dns-port:5053 proxy-dns-upstream:[https://1.1.1.1/dns-query https://1.0.0.1/dns-query]]*
*Sep 10 09:17:36 pi-hole cloudflared[1010]: 2021-09-10T09:17:36Z INF Adding DNS upstream url=https://1.1.1.1/dns-query*
*Sep 10 09:17:36 pi-hole cloudflared[1010]: 2021-09-10T09:17:36Z INF Adding DNS upstream url=https://1.0.0.1/dns-query*
*Sep 10 09:17:36 pi-hole cloudflared[1010]: 2021-09-10T09:17:36Z INF Starting DNS over HTTPS proxy server address=dns://localhost:5053*
*Sep 10 09:17:36 pi-hole systemd[1]: Started Argo Tunnel.*

and did a DIG :

I don't know if it's good or not ...

I have no issue with my Pihole at home (the only difference is that i m not cloudflared ...)
I will really appreciate if you can help me with this.

Regards

Rick

Debug Token:

https://tricorder.pi-hole.net/N4AnXGNY/

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