Need help - Save to Disk template

Hi there,

First of all I apologize if a similar thread is already ongoing but I couldn't find it or if i posted this in the wrong place.

Secondly, I got an issue with calibre that i hadn't before. Besides my Library I normally also save my books in a different folder. I use the 'Save to Disk' tool to do it. Having that in mind and how I wanted the books to look like, i added the following template:

{author_sort}/{series}/{series_index:|| - }{title}

Always worked fine and when I added a standalone Calibre would automatically ignore the hyphen and the series details, which was what I wanted.

Recently I changed computers and now the hyphen keeps showing up. It's okay for a book that belongs to a series, but not for a standalone, which shows like "- title". Previous it would only be the "title". Ignores the series name but not hyphen.

Could anyone tell me what i'm doing wrong or if anything changed in Calibre? Any input will be appreciated.

I use the updated windows x64 version.

Thank You,