Animate Guardian and curse limit

I have a problem here with my curses setup.

I have Arc with 2 curses cast on hit: Elemental weakness and Frostbite as seen. For the additional curse I use the passive node Whispers of Doom

In my Anime Guardian i have another 2 curse setup with Asenath's Genle Touch corrupted with lv 12 Vulnerability. For the guardian max curses I use Cospri's Will and Windscream

Theoretically i should be able to stack 4 curses onto the monsters but as shown here it only goes up to three. Is this intended or is there a bug with the animate guardian curse limit?

Video:
https://streamable.com/0k03i

After further testing, Cospri's will by itself also only allows 2 curses max. The only way would be Cospri AND Windscream to be ably to apply 2 curses of mine + 1 of the guardian

Max curses from different sources don't add together. Your guardian has 3 max curses so if it curses an enemy, the max curses it could have would be 3. When you curse an enemy, the max curses it can have is 2.

It's like totems; if your max flame totems is 4 and your max searing bond totems if 5, you still can't summon 4 flame totems and 5 searing bond totems at the same time.