It looks like Disks|ZFS|Pools|Management displays the used and free from the first pool also at the second:
data 5.46T 2.25G 4.02T 0% ONLINE -
tmp 186G 2.25G 4.02T 0% ONLINE -
while on Disks|ZFS|Configuration|Detected:
data 5.46T 2.78G (0%) 4.02T ONLINE -
tmp 186G 140K (0%) 183G ONLINE -
(the difference in size is because it was copying to the data pool.