This is an easy fix.
Just make sure that if you’re using an Anim Blueprint, make sure it’s set to NONE. (Yes I meant NONE).
That way, when the unit is spawned it will only play the animation you tell it to. Then when that animation is completed, you set the unit to use the Anim Blueprint.
I believe you drag your unit to the graph, then drag off the blue pin and type “anim instance” you can either get, or set it. That’s how you set it.