I don't think that is a weird bug. That large value looks correct to me.
The DC gain should = 1. In other words, if you plug in s = 0, you should get 1. Since there are no zeros, this implies that the product of the poles is the gain:
G(s) = K/[ (s-p(1)) * (s-p(2)) * (s-p(3)) * ... (s-p(9)) ]
G(0) = K/[ (-p(1)) * (-p(2)) * (-p(3)) * ... (-p(9)) ] = 1
--> Therefore K = prod(-p)
Actually plugging it in
prod(-p)
ans =
5.4093e+40
Which is precisely what K is.
