If you're using Premiere Pro 2020 it might be a bug from Adobe : Premiere Pro Timeline Shifts (or First Frame) After Moving Project or Relinking Footage. If you modified the "Media Start" timecodes of your .BRAW you might suffer from an Adobe hidden behavior, please read this article : How do I avoid the Shift Issue in BRAW Studio. So you need to ask yourself two questions : 1) Am I using 2020 version ? 2) Did I modify the timecodes of my footages ? You could have both issues at the same time, but you need to study both issues separately if you want to make sure you fix both !