How to turn off ik-chiains automatic keyframe insertion

Apprentice of Magic

Why is this IK-chains follow sliding into keyframes in Timeline after I created IK-Chains?

I am still a beginner of ik-chains. When I used some previously adjusted nulls with parent-child hierarchical relationship as the parent of ik-chains, I found a problem. First, I bound ikchains to the child null. It's all normal. When I drag the timeline, the position of the ik-chains not only returns to the original bone position, but also inserts key frames for the timeline, which is very strange.