Why do I have multiple appdata_instanceID folders?

NC: 18.0.3 (docker)

I recently noticed that I got 4 appdata_instanceID folders, as I went searching for why my pregenerated previews for imaged don’t work anymore, is this normal?
Note: I migrated my old NC instance to docker a while ago and could have done something wrong back then.
I think I should only have one appdata_instanceID folder, so in case I am correct, how to fix this?

I have just a single on. Perhaps the dates and the contents could give an idea?