Moving a Fluid element change the layout (with one element)

Having one element and moving it, breaks the layout

[Before sort](https://www.dropbox.com/s/7xabnw9it2g1jl3/Screen Shot 2017-11-24 at 13.12.45.png?dl=0)

[After sort](https://www.dropbox.com/s/hszegjl5jvnlslk/Screen Shot 2017-11-24 at 13.12.50.png?dl=0)

And any element added after and dragging result in a broken fluid element.

[EDIT] Just found out that is broke it… However you can still drag an element below the “add” button. That should not be possible.