ripetuti desync dell'orologio con timedatectl

Su server 18.04 sto avendo ripetuti errori di sync rilevati dan piccolo script e qui visualizzati la cosa mi sta creando grossi problemi con alcuni applicativi chi ha idea di cosa li possa causare ? Grazie Andrea

ERRORE DATA -> api: "2018-10-15T13:18+02:00"  server: "2018-10-15T14:21+02:00" 
 timedatectl:       Local time: lun 2018-10-15 13:18:02 CEST
  Universal time: lun 2018-10-15 11:18:02 UTC
        RTC time: lun 2018-10-15 11:18:02
       Time zone: Europe/Rome (CEST, +0200)
 Network time on: yes
NTP synchronized: no
 RTC in local TZ: no

ERRORE DATA -> api: "2018-10-15T14:14+02:00"  server: "2018-10-15T15:17+02:00" 
 timedatectl:       Local time: lun 2018-10-15 15:17:19 CEST
  Universal time: lun 2018-10-15 13:17:19 UTC
        RTC time: lun 2018-10-15 12:14:03
       Time zone: Europe/Rome (CEST, +0200)
 Network time on: yes
NTP synchronized: no
 RTC in local TZ: no

ERRORE DATA -> api: "2018-10-15T14:14+02:00"  server: "2018-10-15T15:17+02:00" 
 timedatectl:       Local time: lun 2018-10-15 15:17:49 CEST
  Universal time: lun 2018-10-15 13:17:49 UTC
        RTC time: lun 2018-10-15 12:14:33
       Time zone: Europe/Rome (CEST, +0200)
 Network time on: yes
NTP synchronized: no
 RTC in local TZ: no

ERRORE DATA -> api: "2018-10-15T14:23+02:00"  server: "2018-10-15T15:26+02:00" 
 timedatectl:       Local time: lun 2018-10-15 14:23:02 CEST
  Universal time: lun 2018-10-15 12:23:02 UTC
        RTC time: lun 2018-10-15 12:23:03
       Time zone: Europe/Rome (CEST, +0200)
 Network time on: yes
NTP synchronized: no
 RTC in local TZ: no

ERRORE DATA -> api: "2018-10-15T14:24+02:00"  server: "2018-10-15T15:27+02:00" 
 timedatectl:       Local time: lun 2018-10-15 14:24:03 CEST
  Universal time: lun 2018-10-15 12:24:03 UTC
        RTC time: lun 2018-10-15 12:24:03
       Time zone: Europe/Rome (CEST, +0200)
 Network time on: yes
NTP synchronized: no
 RTC in local TZ: no

ERRORE DATA -> api: "2018-10-15T14:33+02:00"  server: "2018-10-15T15:36+02:00" 
 timedatectl:       Local time: lun 2018-10-15 14:33:02 CEST
  Universal time: lun 2018-10-15 12:33:02 UTC
        RTC time: lun 2018-10-15 12:33:02
       Time zone: Europe/Rome (CEST, +0200)
 Network time on: yes
NTP synchronized: no
 RTC in local TZ: no