Responsive grid not functioning correctly

Hi,

I’m using the make theme and the columns in the customiser are functioning as to be expected. I haven’t yet used any custom code.

On this page when I create columns each with a video in them and set to 6/12 3/12 etc it puts one on each line. Even more curiously, when you change the size of the browser, when it gets to around 700 pixels, the two videos come back into the same row.

http://www.entrepreneursocialclub.com.au/what-people-say/