Corvus Glaive armour break is not working

Hi,
I noticed some issue with Corvus's armour break. Maybe it's just me but it is a bit of time when nothing has changed so I have decided to ask you guys.
As you can see on the attached pictures amount of damage is slightly changing either with or without armour break. My 5* r5 Corvus should have 370 points of reduction when armour break applied but it doesn't look like.
All below shots are with light attacks
2x armour break

1x armour break

0x armour break

Can you explain. Thx
I noticed some issue with Corvus's armour break. Maybe it's just me but it is a bit of time when nothing has changed so I have decided to ask you guys.
As you can see on the attached pictures amount of damage is slightly changing either with or without armour break. My 5* r5 Corvus should have 370 points of reduction when armour break applied but it doesn't look like.
All below shots are with light attacks
2x armour break

1x armour break

0x armour break

Can you explain. Thx
0
Comments
Here you have youtube link for whole fight
It was normal duel fight without any nodes and boosts.
Thanks