Animation issue: arm moves by itself at the start

I’m creating an animation in the Animation Editor. At the beginning (0:00), I place a keyframe on the arm to keep it in a certain position. Later (for example, at 0:20), I move the arm.

But when I play the animation, the arm starts moving slightly from the very beginning, even though there’s already a keyframe at 0:00. It feels like Roblox is automatically interpolating some motion between nothing and the keyframe I set.

Here is video to understand my issue https://www.youtube.com/watch?v=OlB7h0eCziQ

Add another keyframe it’s the exact same arm position right before the next arm moving keyframe starts

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When it’s starting moving, I need add keyframe right?

Thank you so much, It’s working!

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