'Docker shows 4.11 GB of memory useage but container (with physical limit of 12GB assigned) shows 10GB of useage

I am running Docker on a Synology NAS. It shows that it is using 4.11GB of memory - even though just one container is using 10GB. I thought that the Docker figure is the total memory usage of all containers. Why the discrepancy?

When I installed Docker, I had 4GB of memory installed in my NAS, so max 4GB was correct and it would run up to the max. Since then I have installed a total of 16GB of memory. Is Docker seeing the original max config of memory? If so, is there a way of configuring docker to see the full 16GB. I find it odd that the container can see the full 16GB and seemingly docker itself cannot (may be?).

See screenshot attached.

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dockermemorysynologynas


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