New Site Coding Problems

Hey everyone, I just joined the forum

I have a pretty big problem, I bought the WIDEZINE theme for theme forest and decided to heavily edit it. I am still new to this and during the process I have managed to mess a few things up that I can’t seem to fix. If anyone can help me out I would greatly appreicate it!!

my site: STITCHYOURCULTURE.COM

Things I’ve noticed:
Get errors and website shifts on IE

Website shifts on iPhone

Widgets on the right column run into each other if I add new content

Background doesn’t load on every page

Flickr Widget shifts from page to page

These problems are driving me nuts, if anyone can help let me know. I am a graphic designer and could repay the favor, thanks in advance!