thanks for the help everyone, sorry for the late reply but I had to work this weekend.
I have no more errors in the Flightcrew check or with the W3C CSS Validator. The IDPF validator also gives "no problems found". When I open the file in ADE, the table looks the way it should.
BUT... when I open the book with FBreader or Moonreader on my android device, it still shows :
WHISKEY FIRST CLASS
FBreader and Moonreader are IMO good apps so I really have no idea what could be the cause of this.
Why do I feel the urge to do:
Quarter Bottle : /
Half Bottle : /
Bottle : 1330