Soggy compost

Ive got one of those large bin-like composters and have been using it
for vegetable household waste for around 6 months ,  it has 3 layers
where you have moveable shelves so that once the top layer has got full
you can move it down to the second layer, and so on till the 3rd layer
is ready to use.  

BUT...

Mine is a horrible slimy soggy mess,  Ive been turning it religiously
every week and only putting in the things that are suggested.

what can I do to improve the situation?  HELP!!




-- 
Zaf