Bioshock LS bug?

Neptune Level: I got the research camera and after taking pics headed back
to the Fisherman's area. But the game warns me that I left the sisters
unharvested, and hitting esc shows 4.

But, earlier, right near the start of neptune I 'saved' one and got the
cumulative reward from Tennenbaum, and that was the last LS I've seen the
entire level, though various BDs have been wandering around banging on the
wall. Did I hit a bug or did the LS count get reset somehow? Or do I have
to kill more splicers to get her to appear?

rms


.