2 rear Campagnolo calipers

in Road general
Does anyone know why 2 rear calipers are used on some high-end Campagnolo equipped bikes?
There's a rear caliper at the front (!?) and another rear at the rear. I asked on FB but got no answer. Strange.
There's a rear caliper at the front (!?) and another rear at the rear. I asked on FB but got no answer. Strange.
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Marin Nail Trail
Cotic Solaris
I'm just looking at the 2021 catalogue (page 33 & 37) and it looks like there are two separate calipers (although ALMOST identical in appearance).