Timecode won't start at 0

I am trying and trying to make a timecode for a video (not related to CD, DVD, VHS, or cassete in any way, just using wav files and 1 jpg file) and I'm able to put a timecode onto the jpg file-- good, but it, for whatever reason, thinks that it should start at 00:29:59:02, where the 02 represents frames. When I saw this, I also saw the offset slider and I thought, "Perfect. No biggie. I can just enter in -99999999 and go from there so I offset it to 0. Not ideal, but you gotta do what you gotta do." Then I realized the farthest it goes is an offset of -32766, meaning my timecode starts at a minimum value of 00:20:52:56, where again the 56 is in frames. This is for a 720p 60 fps video, if that's helpful. I looked up a few previous articles with similar issues, but none of the things they said were helpful. For example, one said I could just overlay a transparent video over everything and it'd correct itself, but whenever I try making a transparent video (I'm using a Mac), I go to File>New>Transparent Video... and click on it, but nothing ever happens. I also looked up some potential fixes for that but no luck. Another article said that it's recommended to set the timecode to 1 hour (or 10 hours for the BBC) but I really want this timecode to start at 00:00:00:00 and won't have it any other way. I'm a little lost here. Any tips?