that's what i thought might happen. with a grid css layout you need to specify column widths to make sure the grid stays in place or things will bleed over into the empty space from nearby parts of the grid.
just deleting that line of code isn't quite the solution, you need to try and make sure that there are columns with set width amounts in place (even if you don't use them, for one single column you'd use .col-md-12 for example...)
read up on bootstrap css grid layout for more information.