Operating system: Windows 10
Graphics card: GTX1080
Exact steps for others to reproduce the error
Download the following 2 files
This file comes preloaded with a particle system ready to instance objects from within a collection linked from the Instance_Collection.blend file.
Go ahead and pick the "Instances" colection from the particle setting's drop down menu.
The objects in the "Use Count" are listed correctly.
Save and re-open the file. The list will be populated with a bunch of cubes only.
Enable the "Use Count" option. Now all objects will appear but the cube will remain duplicated various times.
Save and re-load. Even more cubes now!