Calibre unexpectedly creates multiple directories on my kobo

Hi all,

I try to transfer my books to a folder ebooks on my kobo clara bw. For that I have configured the driver in kobo utilities plugin like: ebooks/{title} - {authors}

For testing I used 3 files to upload, of which one consistently lands in a folder "ebks" on the kobo. This letter gobbling also occurs on a seriesname when using a template like ebooks/{series}/{title} - {authors}

The title is "Prescription Alternatives:Hundreds of Safe, Natural, Prescription Free Remedies to Restore and Maintain Your Health, Fourth Edition"

When I change the title to "foo" the results is a expected.

I am at a loss now and I hope that some kind soul can help me with this possibly rookie question.

Thanks, Mark