Strange 'drop-off' keyframes in Premiere audio

What's going on with audio keyframes doing this? I've never had an issue with this before. On some of the track when I create keyframes they work normally and I can create gradual volume changes, but for some reason in certain parts of the track (seems to be no rhyme or reason as to where), when I create a keyframe it creates this extreme 'drop-off' type transition. I can't understand how this would even be a helpful tool. Frustrating as I'm on a tight deadline trying to sort audio changes throughout a project. 

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