The clearing up of the Blacksmith storage is an issue we’re looking to address in the future. Basically since the Blacksmith both produces and uses heavy tools, that creates a bottleneck that doesn’t always get cleared up in a timely manner.
If you have a way for us to reproduce this, we are looking for why this happens:
The game cannot delete saves on its own. Make sure the directory was not changed somehow. Medea brought up OneDrive because that has often been the culprit for others, it moving files around without the user being aware.
It likely got displaced from another area and found a nearby point to regenerate in. Buildings or crop fields can get them to move elsewhere. Displacing boar spawners is going to be easier in v0.8.2.