Projectile velocity doesn't change when weapon equipped

I have a weapon and I spawn dynamically projectile in it using node “SpawnActor from class”. After spawning the projectile I am changing its velocity into 1000. No gravity set. When the weapon is just placed in the level and I push “fire” everything works. Projectile is spawn and flies away but when I equip the weapon to the character the projectile stays in a place. When the velocity is set directly in the projectile blueprint (as the value of velocity of the projectile movement) and I don’t try to change the velocity dynamically then in both situations projectile behaves correctly (flies away). Have maybe someone some idea what should I change?

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