Columns break when resizing the columsn

HI, the plugin was working fine until today.
Lets say I create a 2 column row. ON the left I put an image, on the right another image. All good. Now if i try to resize it by clicking on the handle in the middle, the right column will drop right below the left column and both sit on each other. it never comes back up again no matter what I do and resize again.. How do i fix this bug? Its very annoying as I can no longer resize any columsn.