Chronos Black Frame

When using Chronos on a 23.976 clip I get a black frame before the first frame of the clip I’m using. And the last frame of the input clip is not rendered. This is when transcoding to 29.97. So for example if my 23.976 clip has a frame 90, the result clip in 29.97 does not have a frame 90. Yes I can add an additional frame but this makes it hard to use professionally.