Not all the route GPX data is imported to sync with video

Screen ShotW

When I use either Garmin Fenix 6 or Edge or from Garmin Connect Website They show the complete route. But when editing the video it only shows 1/3 of the route to sync with the video?

You can see from the screen shot it shows the data imported and the video only shows a 1/3 of the route. Are you able to help.. 

Thanks

Pete