Fusion Frame Numbers

For some reason, my Fusion Timeline Frame numbers start at 86400 instead of 0. I'm sure this is a beginner's screw-up, but I can't figure out how to get it back to 0, 1, 2, 3, ... etc. Anyone know the answer? Thanks!

86400 is 01:00:00:00 at 23.976 fps.

This video should help explain the issue if you're using Adjustment Clips.