I did a quick search and didn't find anything, but is this song a little messed up on expert guitar?
The timing seems to go out and makes you miss notes on a specific part of the song that gets repeated a couple times.
It's a relatively slow song so it's not hard to play and keep time, and it felt weird when I started missing notes on those sections.
I asked my brother and he remembers having the same issue when he tried it also.
Is this a known issue?