
I follow those steps for myself on a random test book and it works as intended.
The only circumstance I can think of this would happen is if you're changing the OEBPS/log_page.xhtml file. Everything else should be replaced. Or maybe a full disk, but I'd expect to see errors from that.
So if I'm going to help, I'll need the exact details to try and isolate what's happening:
- What story URL are you using?
- What output format?
- Are you sure you're editing the same format file?
- Do you have FFF's 'Automatically Convert updates' feature on? Converting to what format? (It uses your Calibre Preferred output format setting.)
- What text in what file inside the ebook did you remove?
- Where did you change the author's name? It can be in an ebook more than one place.
- What are you using to check for the changes? Calibre's Viewer or something else?
- Are you sure you're looking at the same format FFF is writing?
- Are you sure you reopened the output format after overwriting?