There was a pool difined for 172.16.0.0/16. The pool size was to big. I've added additional exclusion to free up some aviable leases for an additional pool. Anfortunatelly it accepted exluded range but didn't free up leases.
I've decided to delete pool and recreated new pools. Now i have exluded renges which I cannot remove.
I've rebuild pool but still cannot delete them.
If I have a pool for network 172.16.0.0/16 and exclusion range 172.16.0.1 - 172.16.251.255
It should leave me scope for 1022 addresses in the range 172.16.252.1 - 172.16.255.254.
#show running-config | include dhcp
show multiple exlusion ranges and some of those ara listed twice.