Different behaviers using cloudflare 1.1.1.1

[Sving1024]

I set server_names in the config file to cloudflare's dns server.

server_names = [ 'cloudflare' , 'cloudflare-ipv6' ]

Then when I tried to query the dns entry of github.com, i get:

$ dig github.com @127.0.0.1 -p 5533                  

; <<>> DiG 9.20.0 <<>> github.com @127.0.0.1 -p 5533
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 65507
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;github.com.			IN	A

;; ANSWER SECTION:
github.com.		2400	IN	A	20.205.243.166

;; Query time: 141 msec
;; SERVER: 127.0.0.1#5533(127.0.0.1) (UDP)
;; WHEN: Wed Aug 07 18:14:06 CST 2024
;; MSG SIZE  rcvd: 55

But the entry from 1.1.1.1 is different:

$ dig github.com @1.1.1.1          

; <<>> DiG 9.20.0 <<>> github.com @1.1.1.1
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 48956
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
;; QUESTION SECTION:
;github.com.			IN	A

;; ANSWER SECTION:
github.com.		13	IN	A	140.82.121.3

;; Query time: 279 msec
;; SERVER: 1.1.1.1#53(1.1.1.1) (UDP)
;; WHEN: Wed Aug 07 18:15:31 CST 2024
;; MSG SIZE  rcvd: 55

besides, I also tried to use cloudflared to set up a local doh server using the command cloudflared proxy-dns --address 0.0.0.0 --port 5533:

$ dig github.com @127.0.0.1 -p 5533

; <<>> DiG 9.20.0 <<>> github.com @127.0.0.1 -p 5533
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 44074
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 1

;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1232
; COOKIE: 4208a87df0805fdc (echoed)
;; QUESTION SECTION:
;github.com.			IN	A

;; ANSWER SECTION:
github.com.		8	IN	A	140.82.121.3

;; Query time: 1 msec
;; SERVER: 127.0.0.1#5533(127.0.0.1) (UDP)
;; WHEN: Wed Aug 07 18:19:25 CST 2024
;; MSG SIZE  rcvd: 77

I wonder why this would happen.
Some other infomation:

cache is disabled. Dns-crypt proxy listens port 5533.
Here's the full config:
dnscrypt-proxy-config.zip

[jedisct1]

GitHub is using a CDN, and uses many IP addresses for load balancing. Depending on what server you hit, you may get different responses.
20.205.243.166 belongs to the GitHub's space as well.

[Sving1024]

I knew that. But i didnt change my location or network environment. so if those two ways are using the same dns server, why didnt they return the same ip?