psql (13.1 (Debian 13.1-1.pgdg100+1), server 12.5 (Debian 12.5-1.pgdg100+1))

Dear, I'm new at postgresql and I've installed it on a Debian 10
(stable) server.

I don't know why, but after executing the psql command, I see this message:

psql (13.1 (Debian 13.1-1.pgdg100+1), server 12.5 (Debian 12.5-1.pgdg100+1))

It seems both the posqgresql 12 and 13 are installed at the same time...

I think I've installed postgresql 12, but here I see I have these
packages after upgrade with apt:

ii postgresql 13+223.pgdg100+1 all
object-relational SQL database (supported version)
ii postgresql-12 12.5-1.pgdg100+1 amd64
object-relational SQL database, version 12 server
ii postgresql-13 13.1-1.pgdg100+1 amd64
object-relational SQL database, version 13 server
ii postgresql-client-12 12.5-1.pgdg100+1 amd64
front-end programs for PostgreSQL 12
ii postgresql-client-13 13.1-1.pgdg100+1 amd64
front-end programs for PostgreSQL 13
ii postgresql-client-common 223.pgdg100+1 all
manager for multiple PostgreSQL client versions
ii postgresql-common 223.pgdg100+1 all
PostgreSQL database-cluster manager

Is this correct or do I have to uninstall the postgresql 13 packages ?

Within psql CLI, the version is:

SELECT version();

PostgreSQL 12.5 (Debian 12.5-1.pgdg100+1) on x86_64-pc-linux-gnu,
compiled by gcc (Debian 8.3.0-6) 8.3.0, 64-bit
(1 row)

Thanks a lot!!!