In one battle (Inferno campaign), a group of enemy Berserkers "merged" with the castle gates. When I hovered the cursor over them, it said they were gates. However, they were displayed correctly, both the image and the number. At the same time, it was impossible to attack them, but they successfully attacked my units. However, they could only move under the gates and within a radius of 1 cell from them.
There are some funny bugs...
I had to replay the battle.