How to use Golems?

[Boron]

Test 4:
Gatecleaver Banelord


Other gear: Idea is to maximize attack, the banelord has to kill in the first round.
If he hits with both attacks he should succeed.

Golem is still the charcoil shield golem.

Battle 1:
The Banelord hits with first attack, Golem down to 38 hp, got also an affliction, lost one eye.
Now the weird: The banelord misses his second attack ... vs. 13 defence only.
Golem kills the bane with one strike then, was extremely lucky.

Battle 2:
Banelord again fails one attack, Golem survives with 27 hp and affliction neverhealing wound... .

Battle 3:
Banelord hits with both attacks, Golem dead.

Battle 4:
Banelord hits with both attacks, Golem dead.

Battle 5:
Banelords hits once, Golem down to 27 hp, affliction weakened, kills banelord then.

Battle 6:
Banelord misses the Golem with both attacks ?
Really weird ... . The Golem has 13 Defence, no luck since he couldn't buff yet, Banelord has 25 Attack.

The attack calculator from sunrays site gives 98,8% chance of hitting under these circumstances, for 2nd attack it should even be 99,2%.

In those 6 battles the banelord had 5 failed attacks though and 6 successful ones?
That should be statistically really rare to happen?
Or is it a sign that the attack calculator is not working 100% and there is maybe something hidden in the game mechanics like a cap that the chance to hit can never be higher than 80% or something like that?