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This might explain a lot.
I just came across a thread on another writing forum, where most of the members are self-published authors. It might explain a lot about why so many 'indie' books are terrible. The person posting was saying that she'd just come across a book about grammar and what a lot of rubbish it was! I read on, expecting her to be shot down, but no, some people agreed with her, saying that they were writers not grammar experts and that was why they used editors! Aaaaagh! Surely the key to being a good writer is knowing all the rules so well that you don't even need to think about them?
So if you come across a book with mixed tenses and passive phrasing, it's not the fault of the writer - it's because their editor wasn't any good!