One TR rep comment:
My take from the Ramp Test introduction and the mentions of it in the podcast, the Ramp Test is meant as a steady and incremental addition of stress, to failure. The point is to get your peak effort from that gradual increase and fatigue.
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In that light, standing may well be a crutch, by attempting to use your greater body to “cheat” further into the test than you could achieve while seated.
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Per the TR rep, you may well be spiking and getting further than you could seated, which may well prove problematic in the following workouts (FTP too high).
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Also consider the fact that standing takes more overall energy and fatigue. Mentioned in at least one instance, If you are able to stand (despite the greater physical cost), you may well be doing so in a way that is counter-productive to the test intentions.