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I have checked it: that module was assigned to a single private rack.

Still can't delete that one so something is up!

There was an issue, when modules were assigned just to private racks the Related Rack partial was not displayed at all.
I have fixed that.
I have deleted the module assignment so you should be able to delete the module.
I am working on a feature that will allow mods to delete modules no matters if assigned or not ...