Just to clarify. The cron jobs are added for user hestiaweb but they run as root (you will see that all commands use sudo).
Ok, remove this file:
rm -f /var/spool/cron/crontabs/hestiaweb.vst.back
Use this command to edit crontab and save (there is no need to modify anything, just edit and save):
crontab -e -u hestiaweb
Wait five minutes and check whether cron jobs run again:
grep 'CRON.*v-update' /var/log/syslog