@munsterlander : Thanks for the response. The example in the docs (your link) works. I researched a little bit and found out that the false CarousselItem is shown when the caroussel is used inside a tabbar.
Here is an example with a tabbar. I doesn’t work as expected: https://codepen.io/anon/pen/vypwJo?&editors=101
Here is an example without tabbar (works as expected): https://codepen.io/anon/pen/rWpgGv?&editors=101
I opened an issue for this: https://github.com/OnsenUI/react-onsenui/issues/189