I have recorded my motion capture with 2 Kinect cameras and done my calibration based on board.

The cameras appear to be lined up correctly, but the depth data sets appear to be 1 frame offset form each other. So a swinging arm looks like 2 arms with one lagging behind. I guess there was a dropped frame somewhere causing all the frames to be shifted by 1.

Is there any way to fix this? Seems like there should be a way to calibrate the timing lineup or just manually offset one of the depth data.

There is an ability to set the time sync between the cameras manually when using a "Build Combined Video" function in iPi Recorder. So you can try to fix the issue there.
https://docs.ipisoft.com/How_to_Build_Synced_Multi-Camera_Video