Do Zombies have higher HP

[Sandman25]

I have just got this:

  Code:

The helpless shadow dragon zombie fails to defend itself.
You perforate the shadow dragon zombie like a sieve!!!!!(damage 157)
You hit the shadow dragon zombie but do no damage.
You hit the shadow dragon zombie.(damage 1)
The shadow dragon zombie completely misses you.
The shadow dragon zombie misses you.
The shadow dragon zombie claws you but does no damage.
A swamp dragon zombie comes into view.
You hit the shadow dragon zombie.(damage 3)
You destroy the shadow dragon zombie!

It looks like Shadow Dragon Zombie had 161 HP. Is it possible provided wiki lists "102-149" and chatbot told me

  Code:

 shadow dragon (D) | Spd: 10 | HD: 17 | HP: 108-150 | AC/EV: 15/10 | Dam: 20(drain), 15, 15 | evil, cold-blooded, see invisible, fly, !sil | Res: magic(113), cold++, poison, drown, neg+++ | Vul: holy | Chunks: rot | XP: 2067 | Sp: b.draining (3d24) | Sz: Giant | Int: animal.

Or is it definitely some bug in my code?

Edit. Oops, I forgot zombies have special HP: HDd5 + 6*HD, for Shadow Dragon it will be 17d5+6*17=107-187 HP. Sorry about the question.