Animation Montage does not play as correctly with blended animation

I have problems about animation blending. When i play animation montage, It is play well but has bad blending quality.
First, i want to play animation below:

339414-montage.gif

but actual animation is below:

339415-ingame.gif

you can see right arm moving just a little with at that same time the debug line is drawn. I want to play animation montage at first image. How can i solve this?
I think it should be override animation montage slot then animation in game can play well but i don’t know what should i do.

this is a animation blueprint.
339831-

I had something similar, check the animation file, or the montage file for a setting that’s called Blend In and Blend Out and make it smaller/larger.

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Oh my god THANK YOU SOOOOOOOOOOO MUCH! I solved it!

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mindsurferdev May 25 '21 at 10:10 PM
I had something similar, check the animation file, or the montage file for a setting that's called Blend In and Blend Out and make it smaller/larger.

In my case, the animation montage is shorter than Blend In time. Animation is finished before Blend In. So i can see the animation like the second image. I just change Blend In and Blend Out to 0