Gecklib attack animation not syncing with damage

In using the geckolib plugin, I’ve noticed that when a mob with an attack animation attacks you, the player is damaged and then, the animation plays. In the mod “Call of Yucatah” created by “Sweetygamer2” they seemed to be able to use attack animations, and they work properly.

So is there anything you can suggest, for a solution to this problem of damage and then animation.

Thank you