Dragonhelm Knight bug

So, I was playing this multiplayer( Game number: 6512685949124608 ) When my friend used the Dragonhelm Knight’s Call out the Dead ability.

So, the 3000 dwarves were about to reach Witchesrange, when he pulled them back.
At that time, another 2000 stack was coming down.
When he used the ability, the 3000 stack started moving up as expected, but when it combined with the 2000 one, it again started coming down! :neutral_face:

I thought that bug, highlighted in

had been fixed. Please look into it. Here is a screenshot.