Paperwhite ignores indents

Thanks for your help.

I've produced .mobi from epub using kindlegen. Everything was marked up by me, no conversion software at all other than kg.

On the kindle previewer all looks fine on all devices except the Paperwhite, which loses the para indents and substitutes a blank line.

Anything I can do in the way of an @media to stop this and force indents?

Thanks again,

Dave