question about curve secp112r1
You misread the parameters: $p$ is $$\mathrm{0xDB7C2ABF62E35E668076BEAD208B} \text,$$ but $a$ is $$\mathrm{0xDB7C2ABF62E35E668076BEAD208\underline{\mathbf8}}$$
which is $-3$ $\bmod p$!