在Bootstrap / Javascript复选框菜单中没有排队的Div

I made this checkbox menu. I want all divs to line up under and around each other when each box is checked, which some do beautifully, using Bootstrap. However, when you check "Research Methods," the two divs are separated from eachother and don't line up at the top/next to each other. I am wondering why this is? Here is a live demo:I made this checkbox menu. I want all divs to l