"Observation contradicting previous knowledge" is literally the point of experimentation. If gravity were to do such a thing, either A) it was indistinguishable

"Observation contradicting previous knowledge" is literally the point of experimentation. If gravity were to do such a thing, either A) it was indistinguishable from random chance and we incorporate a concept of uncertainty into our understanding of gravity (which has actually happened), or B) it'd be reproducible and we'd... update our understanding of gravity (which has also actually happened). In neither case do we receive information we can use to determine "meddling".