This command returns an old date:
> $ curl -sI https://download.FreeBSD.org/ports/index/INDEX-13.bz2 | grep Last-Modified
> Last-Modified: Fri, 06 May 2022 01:25:17 GMT
It should be updated more frequently than that.
 Repology doesn't update the FreeBSD repository for 3+ days. (https://github.com/repology/repology-updater/issues/1245#issuecomment-1121508484)
Can you check that the sync between portsindexbuild and the INDEX mirrors is fine?
That should be fixed in all mirrors in a few minutes. If it doesn't, please re-open this.
And thanks for the report.
$ curl -sI https://download.FreeBSD.org/ports/index/INDEX-13.bz2 | grep Last-Modified
Last-Modified: Mon, 09 May 2022 18:59:21 GM