"Random" vertical gaps appear in questions. They don't seem to be justified by the context.
The overall effect is that a question with 3 lines of copy has huge amounts of white space, a lot of space for comments and a notice (like a "closed" notice) very far away from the post it belongs to.
See for example this comparison with StackOverflow. No major white space, font and colours are used to maximize the visibility of the elements and to minimise the wasted space.