There is something else going on here. I already have a few books with authors whose authors look like that. I use the same save template and have no problems with them. As a test, I created a dummy book with author "E. F. Benson". When I sent it, the directory was "Benson, E. F_". This opened with no problems.
Can you point me to the book you are having problems with? It might be something else in the title. Or, it could be something in the book. Also, what firmware version? My testing is with 3.16.0, but I don't believe there has been a change in this for a while.
As to replacing a copy of the book on a Kobo device, you shouldn't have to power down to see it. When you disconnect from the PC, the device checks all books to see if they have changed. If the file size does not match that in the internal database, the book is completely removed from the database and then processed as a new book. The KoboTouch driver cheats and updates the file size in the database when you resend a book. This means that if you are only tweaking the book, fixing spelling, styles and the like, you don't lose the reading status or bookmarks. But, it can be a problem if the structure of the book changes. That is if you rename internal files or change the ToC. The book will usually open, but the reading position might not be remembered and the ToC probably won't work.
If you changed the cover when you resend the book, that might not get refreshed unless you power off. The device caches the covers for a few books in memory. If the cover is in the cache when you resend the book, it won't update until you power off or enough other covers get loaded into the cache to push the wrong one out.
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