RAM usage in dashboard not correct?

Hi, I’m using duplicati as docker image, with tmpfs mapped to the host, so the temp-files are created in RAM rather than on disk, to spare my poor SSD’s. I thought this wasn’t working, as the RAM usage in the dashboard doesn’t go up. However, when looking with htop or top, of even df, I actually see the tmpfs (and thus RAM) being used. FYI, duplicati creates archive files on temp storage (500MB chunks in my case), then uploads them to the destination and deleted the archive on temp. When that happens, I can see that in memory with htop, top and df, but not in the dashboard. THe three screenshots were made about a second or two apart from each other, the tops clearly showing much more memory usage than the dashboard.

In fact, even when I stop all docker containers, the memory shown in the dashboard is different from what top / htop actually shows. What’s the reasoning behind that and will this be changed in future releases?