Large files when exported from folder structure in Publish Service.

I have incidentally discovered some very strange behavior when exporting images via a Publish Service. It only happens when the images are located within a folder structure and I select the top folder to update all the subfolders. The Publish Service is set to export a JPG quality of 60%, but only the first exported folder is correct, all subsequent ones are 100%. This can result in files that are many times larger. 

The problem can easily be avoided by exporting one folder at a time instead of all at once. However, with many folders, this can be quite time-consuming. My old Mac can only run an old version of LR Classic (11.41) and I don't know if the problem still exists in newer versions, but I just wanted to mention it anyway.