Layout bug at the bottom

Hello,

Thank you for the package, it's very easy to use it.

I just noticed that at the bottom, it's not render as excepted.
There is space to allow the last block to move in the other column but it's not the case.

Someone know how to fix that please ?

(I found that the demo that the behavior is the same: https://cedricdelpoux.github.io/react-responsive-masonry/)

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