Post Preview vs. Post apperance

Hello all,

I'm new here and have tried to post some of my listings in my blog section.  They appear to look how I want, but when I post they show up different(pictures in wrong place, text moved, etc...)  I generally do well with this sort of thing, but this is a little bothersome.  If someone has some insight on this it will be greatly appreciated.

Any help on this???

Kind regards,

Marc