What happened is that someone stopped the camera, played back what they shot, and then when the shot ended, they pressed stop. But not until after the tape rolled past the last image for a second or two. So then when they started recording, the camera didn't pick up where it left off...it started over, as if the tape was brand new. So, the timecode on the tape itself started over at 00:00:00:00.
Ugh. Hate inheriting stuff like this. Last time this happened to me, I was fixing random wrong shots all over the show because the same timecode numbers appeared in multiple places on the tape and the assistant did not assign a new reel number to any of it. Just kept telling myself the meter was running (paid by the hour).