After setting the IK to FK the animation still moves when changing the blend from 0 to 1. See video below. I used the bind pose to set up the IK and it all looks correct. Is this a problem with they way the character is set up?
As a work around I can sometimes separate the keys over a time period so it isn't as noticeable but it doesn't work all the time with some strange things happening in between.
Here is the other leg which is much worse.
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