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Memory usage shown with `free` command does not match the utilization from System Monitor

When I am using free -m to check memory status, I get the following:

$ free -m
         total     used     free    shared  buff/cache   available
Mem:      7641     5125      188       739        2327        1476
Swap:     3755        0     3755

This shows 67.07% in used memory and 30.05% in buffered/cache.

However when I look at the System Monitor (I am using Ubuntu 18.04), I see this:

Memory
5.9 GB (78.8%) of 7.5 GB

These two do not match up. Can someone shed some light on this?