The sudden strengthening of the Leviathan??

I will write right away that for 2 years, every day, I have been fighting in the fleet arena, with the same player. No ship stats have changed for all these 2 years. 

And yesterday the strange things began. I always went through the battle with my executioner, also without changing any stats of the ships. 

And for some reason, the opponent's ships have more defense (I have already learned the approximate damage figures for the opponent's ship in 2 years) and the damage of my ships has noticeably changed and decreased. 

Punishing, always killed Mark (after his elimination) from the base. I just demolished all 10 stacks of Mark, with a basic attack. Now the Punisher destroys only 6 stacks, 4 always remains. 

Again, I have already written about this more than once on the forum and in the support in the game. There were 7 times more evasions in the fleet.