I don’t recall this happening previously, I wasn’t doing the same thing.
Downloaded 188.8.131.520 and was setting up a sequence per the enclosed image!
When I ran the sequence for only 1 Light image, it created a Folder the target Light image but it also created other folders (Flat, Dark, Bias).
All four of the folders contained an image file with the sane filename as from the Light sequence.
Is this normal?