Something odd I just noticed on the title pages of both fics.
"The Elder Scrolls, The Elder Scrolls , Crossover"
"2001: A Space Odyssey, 2001: A Space Odyssey , Crossover"
Somehow both of my regexes produce a duplicate entry with a space at the end. I think this might be a side effect of the standardization regex?
EDIT: I resolved it! Putting a space at the beginning of each of the patterns in the first regex resolved it (I removed the space from the 2010 pattern). I don't know why it fixed it though.