'Chapter' Title Cards Question

I remember being mesmerized by this film when I first saw it in San Francisco back in 1980, and I've never been able to see it since then (no Region 1 DVD, alas...). Recently, I was finally able to see it again at a screening at LACMA in Los Angeles.

When I originally saw it, I remember the "Chapter" Title Cards as being numbered "-2,-1,0,1,2." But at the recent screening they were numbered "0,1,2,3,4."

Am I mis-remembering a number sequence from a different film, or has the number sequence indeed been changed? Anybody know?

"Gravity is a harsh mistress." -Tick