Audio Tracks Disappear When Zooming on Timeline

It's very strange, but whenever I zoom in on a certain portion of a timeline I'm working on, audio tracks warp, change, duplicate, or disappear altogether. See below for a video:
Does anyone have any idea as to what this could be? Thanks in advance for all and any help!

It's actually a feature film I've been working on for quite a while – most likely several CC versions back, maybe even from CS6 – sorry I can't remember off the top of my head. Could that be what's causing it? Is there any fix? Or do projects that have been upgraded several time throughout CC update history always have this issue?
Thanks in advance for your help!

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Audio Tracks Disappear When Zooming on Timeline

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