Understanding ZFS Replication ... not all data synced?

I have setup a ZFS Replication of 2 datasets on my NVMe storage to my HDD ZFS array - on the same Truenas Host.

I backup the following datasets with all child datasets:

nvme1 > docker
nvme1 > exchange

to the following destination

hdd1 > backup > truenas > docker
hdd1 > backup > truenas > exchange



Now this is scheduled to run weekly and all seems fine in the GUI:



When I now check the contents of the datasets (hdd1 > backup > truenas > docker) it is not the...

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