[cybmole]

I got into san apparent mystery where I was moving a book from calibre library to tablet, and was seeing it tagged as mystery, suspense, thriller, adventure.... even though there were no tags in calibre.

after various moved & deletes and after eliminating Calibre companion as a suspect, I find that it is because in the opf of the book there is this:
<dc:subject>Suspense</dc:subject>
<dc:subject>Thriller</dc:subject>
<dc:subject>Mystery</dc:subject>
<dc:subject>Adventure</dc:subject>

so is there an automatic way to have calibre replace those with what is in its own metadata i.e. in this case, replace with no tags, when the book is moved out to tablet. I moved it 2 ways - with calibre companion, and with calibre cloud via dropbox, both ways I got the unwanted tags showing in the mantano pro app bookshelves on tablet.

that book has been in my library for a while, so I don't recall if those 4 tags showed up & were manually zapped when I used add books, or not.
is there any simple way to check what other books in my library contain tags that are out of sync with calibre tags ?

I did inspect a couple that arrive on tablet with correct tags, and in those cases the mantano app must be picking up the calibre tabs, as there's no tag data inside of their opf. If calibre does stash a copy of its tags inside of epubs, then where does it put them & does it only do that when send to disc is used, & not when book is served via content server ?