Why?

Why on this blog program is there one view when you are actually composing, another slightly different one when you preview, and then when you post it completely changes the spacing so that it looks weird, but if you try to edit again it looks as if it should be just the way you want it? Don't they know that some of us are detail oriented and will spend hours trying to get things just right with equal spacing between paragraphs and photos?! Computers are great, but sometimes I wish they wouldn't try to "think" for me!