Help With Bug (That I created) WP-CODA:

I realized today that IE has some problems with my customized WP-CODA theme. Original theme: https://wordpress.bustatheme.com/coda/. On my version the right arrow is missing, and the last two pages don’t slide over… Any WP pro’s got a minute to help a newb?

Here’s the site: https://tinyurl.com/yk72frk.

Thank you!