openSUSE Tumbleweed 20210115 (x86_64)
KDE 5.78.0 Plasma 5.20.5
Qt: 5.15.2
gkrellm 2.3.11

If I start 2 instances of gkrellm and put one on each monitor and then shut
them down they only remember one position the next time they are started.
Starting two instances results in both starting at the exact same position on
screen, one on top of the other.

"allow multiple instances" is checked in the configuration dialog.

In $HOME/.gkrellm2/data/startup_position i only see one set of coordinates
which correspond to the last instance to shutdown, but only if the last of the
two instances is moved (on screen)first, otherwise it never writes to the file
and the stored coordinates are from the first instance to shutdown.