video beatgrid issue

when doing the beatgrid in the video version of the same song that i have the audio version for is terrible.

when doing handling the beatgrid in the audio this track is fine no problem.

when handling the same edit in video the beatgrid falls off at bar 6.1 and then is completely gone after that.  i have tried this in 4.2.4 - 4.2.0 and the latest beta that is out.

anyone have any ideas, thanks

Chris