Using multi-platform base images
The digest shown on Docker Hub is platform-specfic. When you click on a tag, it brings you to the first architecture only.
To get digest of the entire multi-platform image, you could use nerdctl as shown below or docker buildx imagetools inspect <image>:<tag>.
$ nerdctl image inspect --mode native bitnami/pgbouncer:1.20.1
[..snip..]
"Image": {
"Name": "docker.io/bitnami/pgbouncer:1.20.1",
"Labels": null,
"Target": {
"mediaType": "application/vnd.docker.distribution.manifest.list.v2+json",
"digest": "sha256:710da11a466f98b90380fb8e02b487aacf8ef33b07acabb402067c122ac63e8d",
"size": 529
},
"CreatedAt": "2023-10-02T14:54:49.666483Z",
"UpdatedAt": "2023-10-02T14:54:49.666483Z"
},