b2 reports significantly more CRs than other detectors

In doing some work for PIPE2D-1609, I noticed in the processing logs that b2 was finding significantly more CRs, by an order of magnitude:

(arm: 'b', spectrograph: 4, visit_group: 115842) - Found 717 cosmic rays (4207 pixels)
(arm: 'b', spectrograph: 4, visit_group: 115842) - Found 760 cosmic rays (3717 pixels)
(arm: 'r', spectrograph: 3, visit_group: 115842) - Found 538 cosmic rays (5989 pixels)
(arm: 'b', spectrograph: 2, visit_group: 115842) - Found 7476 cosmic rays (22295 pixels)
(arm: 'r', spectrograph: 3, visit_group: 115842) - Found 654 cosmic rays (6274 pixels)
(arm: 'b', spectrograph: 2, visit_group: 115842) - Found 7564 cosmic rays (21694 pixels)
(arm: 'r', spectrograph: 2, visit_group: 115842) - Found 582 cosmic rays (6638 pixels)
(arm: 'b', spectrograph: 3, visit_group: 115842) - Found 623 cosmic rays (4588 pixels)
(arm: 'b', spectrograph: 4, visit_group: 115842) - Found 0 overlapping cosmic ray pixels
(arm: 'r', spectrograph: 4, visit_group: 115842) - Found 499 cosmic rays (5647 pixels)
(arm: 'r', spectrograph: 3, visit_group: 115842) - Found 531 cosmic rays (5511 pixels)
(arm: 'b', spectrograph: 2, visit_group: 115842) - Found 7435 cosmic rays (22040 pixels)
(arm: 'r', spectrograph: 2, visit_group: 115842) - Found 585 cosmic rays (6812 pixels)
(arm: 'r', spectrograph: 4, visit_group: 115842) - Found 664 cosmic rays (6475 pixels)
(arm: 'b', spectrograph: 3, visit_group: 115842) - Found 520 cosmic rays (3471 pixels)
(arm: 'r', spectrograph: 2, visit_group: 115842) - Found 712 cosmic rays (7088 pixels)
(arm: 'r', spectrograph: 4, visit_group: 115842) - Found 550 cosmic rays (5557 pixels)
(arm: 'b', spectrograph: 3, visit_group: 115842) - Found 539 cosmic rays (2820 pixels)
(arm: 'r', spectrograph: 3, visit_group: 115842) - Found 0 overlapping cosmic ray pixels
(arm: 'b', spectrograph: 2, visit_group: 115842) - Found 5139 overlapping cosmic ray pixels
(arm: 'b', spectrograph: 3, visit_group: 115842) - Found 0 overlapping cosmic ray pixels
(arm: 'r', spectrograph: 4, visit_group: 115842) - Found 0 overlapping cosmic ray pixels
(arm: 'r', spectrograph: 2, visit_group: 115842) - Found 0 overlapping cosmic ray pixels

The visit_group is 115842 and has visits 115842, 115843, 115844. Zooming in on a random section of each of those visits shows masks for CRs where there does not appear to be an actual CR in any of the three visits.

I additionally processed trace=115957, 115958 and neon=115830, 115831, 115832. The second set of trace values also show a magnitude higher order for b2. The neon arcs don't seem to be out of line with the other detectors but I still need to investigate a bit more.

FYI, I'm working on the tools to make CR QA reporting easier.