Yes, I’m sure I shot 59.94. I actually figured out the problem though. My shutter speed was not set high enough. Turns out it needs to be at least double the frame rate. Makes sense, but I didn’t even think about it when I was shooting.
I don’t know if this information helps diagnose my problem, but when I scrub through the interpreted clip frame by frame, it looks like it has duplicated every frame. Each frame is held for the length of two frames.