Gaussian Blur is not following my keyed frames

This happened to me, but the adjustment layer did work for me. I found that I needed to change my Easy Out keyframe back to linear and that worked.

good going !  As inspector Clouseau would say, " Problem Solv ED "  Might as well mark your solution (yourself) as "correct answer" so it gets a check mark and others can use it throughout time to solve similar problem.

that's weird. maybe the 2nd keyframe is messed up. maybe the program thinks it's not the 2nd keyframe. I would probably just start over and make sure I make the keyframes in right order. Like, delete the 2nd and 3rd. Then make sure blur is set to 100 and make second, then make 3rd (also initially set to 100, but after it is made dial it down to 0 ).  See if that fixes . Otherwise I'm baffled.

sounds like you have to add another key frame where the blur is still full.

for example, keyframe 1 is fully blurred... now go down a ways to where you really want the blur to start clearing and put another key frame of it being FULLY blurred.  Then go down to where you want it clear and put your keyframe for fully cleared.

You can make slight adjustments use Bezier, ease in, ease out, etc. but the main thing is to add that new keyframe. Otherwise it doesn't know where to start going clear and starts doing it immediately.