I have the same problem as this person: Upload credits bug?
This is the suspected model: Finnish Winter War & WW1 Stahlhelm M1916 - 3D model by CHooverShrimp (@CHooverShrimp) [27f41c6] - Sketchfab
Context: I tried to re-upload with substance painter to see if the material is better (it is). I first private it, then re-upload, and then un-private it. Then it strikes me that I have used up one credit.
After a quick search, I found the person have almost the same problem.
In my profile, I also have 10 items, even though I actually only have 9.