How many ads can I put in right sidebar?

I have 6 AdSense ads set up in my right sidebar. They are 120×600 Skyscrapers. However, only 5 of them are showing up on my site. I have deleted the code for the 6th one and repasted it, making sure I had copied it correctly from AdSense, but it’s still not working.

I was wondering if it’s because with the Pinterest theme I not able to actually put anything more on the sidebar than I already have.

If this is not the case, does anyone have any suggestions? Is this an AdSense issue and not an issue with my theme?

Here’s my url. http://blissfulmiss.com

Thanks