Calendar issue in 2.5.1

Hey guys, I added the calendar to a different theme that previously didn’t have it. It displays properly for the current month, but when I click the previous month link (currently May) it shows the calendar with a weird spacing issue. It’s like the margin is now gone and there is a strange spacing/column in the middle of the calendar for the old month.

Like I said, it displays properly for the current month, but not the prior month.

My site is NSFW so if you’re under 18 or at work, stay away. It’s not some porn site, it’s just my blog and it of an adult nature. Any help with fixing the previous month issue would be greatly appreciated.

eltardo.com is the site url.