Hi,
For me, if you have an adaptive column with more height than the following adaptive column, the following column alternately jumps up / clears the previous column, as you resize the browser pixel by pixel.
It's difficult to explain, if you look at the adaptive columns example in the docs, and inject a load of content into say column 5, the subsequent columns that are shorter than column 5 flicker between clearing and not clearing column 5 as you slowly shrink the viewport.
If you can see it happening,
.elastic-row-last + .column {clear:left;}
seems to sort it. It essentially says any column after the last column in the row should clear it.
Kind regards,
Mike