Vyos 1.3-rolling-202005130117 strange memory usage in 2020001311637 never had this problem

We dont use default ssh port but i dont understand why we got planty of this staff and when i mean planty is lots lots

Jun 02 12:13:28 vyos sshd[27324]: Disconnected from authenticating user root 190.145.5.170 port 40084 [preauth]
Jun 02 12:13:28 vyos sshd[27326]: Failed password for root from 106.13.198.131 port 51684 ssh2
Jun 02 12:13:29 vyos sshd[27326]: Received disconnect from 106.13.198.131 port 51684:11: Bye Bye [preauth]
Jun 02 12:13:29 vyos sshd[27326]: Disconnected from authenticating user root 106.13.198.131 port 51684 [preauth]
Jun 02 12:13:33 vyos sshd[27328]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=106.13.228.13 user=root
Jun 02 12:13:35 vyos sshd[27328]: Failed password for root from 106.13.228.13 port 44426 ssh2