Desperately Seeking Formatting Help

Why are my paragraphs not showing up correctly?

Seriously, I cannot figure out why the spaces between my paragraphs are so wonky. Sometimes I get a large space, sometimes I get NO space, even though I leave a line, or sometimes even two or three lines between paragraphs and sometimes it even works just like I want it to.

It's not even consistent within one post. I just never know what I'm going to get.

If anyone out there knows the answer to this deep question, please let me know what to do.

My children are starting to believe something they have suspected for a long time now. They think that I am incompetent. (Which I am, of course, in some things. But I really can type a legitimate paragraph.)