DHCP Does not re-use IP Addresses from DHCP scope

[easyronny]

Dear Opnsense forum members,

I have been running Opnsense for almost one year now to my complete satisfaction.
I only notice something strange, I have a /23 ip range where last set (.1.*) of 254 addresses are reserved for a DHCP scope (192.168.1.1 - 192.168.1.254).

The first set (.0.*) I use it for fixed IP reservations.
(192.168.0.1 - 192.168.0.254).

Well I only see that DHCP keeps adding up IPs after the last issued IP Address.
Even if the lease time (2 hours) has already expired of the previously issued IPs it does not give a used IP again to a new machine.

Default lease time (seconds) => 7200 seconds

Which option did I forget to configure or where should I change something,
I have already searched several times for similar issues on this forum but unfortunately I do not see them on or I used the wrong search citeria.

Many many thanks for your time and help,
Ronny