I published an ebook today on Kindle and Lulu. Instead of formatting the Normal Style for the layout I wanted -as I usually do - I just hit Enter to create spaces between paragraphs. As I was using white space to separate the paragraphs I didn't use indentation for the first line.
The book formatted as I intended on Lulu but not on Kindle where the first line of each paragraph was indented - even though indentation is not set in the default Normal Style - and there was no white space between the paragraphs. This is the first time I have seen this happen and if anyone publishes on both Lulu and Kindle they should be aware that this can happen.
I think I will stick to using Styles in the future.