When I do "/run SortBags()" it always leaves empty spaces
Tried to disable all other addons, same result

I don't understand, what's random about this? Where else would you expect the empty slots to be? I have noticed weird behavior shortly after zoning in sometimes which I still need to investigate but I don't see that in those pictures.

It took me some time to understand that bags in this addon are sorted from bottom to top. Maybe there is an option to change it. I will look at it. Not a bug, sorry.