I see the Planar Surface and the Planar Grid BUT I do not see any tracking splines in the images you posted.
To be clear, the Planar Grid works as a child of the Planar Surface – so there’s no information of worth in what you’ve described, other than your tracking results being unsatisfactory.
You will have to show us the tracking splines, a screen grab of the Tracking Panel (for us to see the props you’ve enabled and where applicable, their values) a low rez of the entire footage will be good.
Cheers
– Roland
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