Snapshots of my VM instance are not being created

[vporton]

I have snapshot instances main-instance-backup and free-instance-backup:

free-instance-backup us-central1 Every day, starts between 6:00 AM and 7:00 AM 7 days
not in use
Dec 10, 2022, 12:19:59 AM UTC+02:00
main-instance-backup us-central1 Every day, starts between 6:00 AM and 7:00 AM 14 days
not in use
Apr 30, 2023, 11:46:06 PM UTC+03:00

But new snapshots are not being created:

Here is my VM instance-2 that is not being backuped every day:

Please help me to make backups work!!