Can you swap round the inner trays or products?
The illustrated inner trays were designed to help you identify your solid products. For example, the "hair" tray has one side for your solid shampoos and another for your solid conditioner. It's up to you which side you want to see! Of course, if you have both of these products, you can put them both on the same inner tray. By using the red Incredible Organiser to hold them, you'll know that they're products for the hair.
Ideally, you should have the other organisers (face and/or body), along with their associated inner trays, to hold all your solid products. Once you have all three, you can swap the trays and bases around as you wish! The most important thing is that you know which products are on which one!