Incorrect definition of table mysql.event

Hello... I have installed MariaDB 10.3.13 in Centos 7. All worked well, but when I execute the following command: "service mariadb status", several errors are shown regarding incorrect definition of table mysql.event and some InnoDB problems. Full command output is this:

root@vps [~]# service mariadb status
Redirecting to /bin/systemctl status mariadb.service
● mariadb.service - MariaDB 10.3.13 database server
   Loaded: loaded (/usr/lib/systemd/system/mariadb.service; enabled; vendor preset: disabled)
  Drop-In: /etc/systemd/system/mariadb.service.d
           └─migrated-from-my.cnf-settings.conf
   Active: active (running) since Sun 2019-02-24 22:34:04 -03; 1 day 12h ago
     Docs: man:mysqld(8)
           https://mariadb.com/kb/en/library/systemd/
 Main PID: 12247 (mysqld)
   Status: "Taking your SQL requests now..."
   CGroup: /system.slice/mariadb.service
           └─12247 /usr/sbin/mysqld

Feb 24 22:46:39 vps.desytec.com mysqld[12247]: 2019-02-24 22:46:39 32 [Warning] InnoDB: Table mysql/innodb_table_stats has length mismatch in the column name tabl...ql_upgrade
Feb 24 22:46:39 vps.desytec.com mysqld[12247]: 2019-02-24 22:46:39 32 [ERROR] InnoDB: Column last_update in table `mysql`.`innodb_table_stats` is INT UNSIGNED NOT...mismatch).
Feb 24 22:46:39 vps.desytec.com mysqld[12247]: 2019-02-24 22:46:39 32 [ERROR] InnoDB: Fetch of persistent statistics requested for table `horde`.`horde_dav_schema...s instead.
Feb 24 22:46:40 vps.desytec.com mysqld[12247]: 2019-02-24 22:46:40 37 [ERROR] Column count of mysql.proc is wrong. Expected 21, found 20. Created with MariaDB 100...this error
Feb 24 22:46:40 vps.desytec.com mysqld[12247]: 2019-02-24 22:46:40 37 [ERROR] Incorrect definition of table mysql.event: expected column 'sql_mode' at position 14...EATE','POS
Feb 24 22:46:41 vps.desytec.com mysqld[12247]: 2019-02-24 22:46:41 45 [ERROR] Incorrect definition of table mysql.event: expected column 'sql_mode' at position 14...EATE','POS
Feb 24 22:49:43 vps.desytec.com mysqld[12247]: 2019-02-24 22:49:43 47 [Warning] Access denied for user 'admin'@'localhost' (using password: YES)
Feb 24 22:49:43 vps.desytec.com mysqld[12247]: 2019-02-24 22:49:43 48 [Warning] Access denied for user 'admin'@'localhost' (using password: YES)
Feb 24 22:49:57 vps.desytec.com mysqld[12247]: 2019-02-24 22:49:57 55 [Warning] InnoDB: Table mysql/innodb_table_stats has length mismatch in the column name tabl...ql_upgrade
Feb 24 22:49:57 vps.desytec.com mysqld[12247]: 2019-02-24 22:49:57 55 [ERROR] InnoDB: Column last_update in table `mysql`.`innodb_table_stats` is INT UNSIGNED NOT...mismatch).
Hint: Some lines were ellipsized, use -l to show in full.
root@vps [~]#

Can you help me to solve those problems?

Regards Jaime