I\'ve built a layout using Bootstrap 3, and I have the following problem: I have a news section that is set to display a total of 9 news items, 3 on each row, summing 3 rows
You're so close. The column classes have the float attribute set in the bootstrap styles and your column is floating, just not where you expect it. That middle column in the 1st row is preventing the one you see floating off in the blank space from wrapping properly because it's taller than the others. All you need to do is wrap each group of 3 in a row like this:
//stuff here
//stuff here
//stuff here
//stuff here
//stuff here
//stuff here
//stuff here
//stuff here
//stuff here
Set it up like that and you're ready to go.