qp functor VPP coordinates a bit different than other qp VPP coordinates

[jessecarterMOOSE]

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Question

I wrote a FunctorQPSampler that uses Functors to sample AuxVariables at quadrature points ( so it works on nodal aux vars). I'm doing a mechanics problem with a displaced mesh. I'm noticing that the coordinates that come out of my FunctorQPSampler are a bit different than other VPP's I'm running that sample (non-functor I guess) material props at qp's. An example coordinate is (0.209748, 0.417162) vs (0.209607, 0.417113). I'm definitely running on the displaced mesh because if I wasn't the values are much more off (0.208333, 0.416667 for undisplaced). I agree it's subtle, but is there something I can do to get the values to be more consistent?

[jessecarterMOOSE]

omg, I just realized I had my FunctorQpSampler executing on TIMESTEP_BEGIN while my other VPP's at TIMESTEP_END 🤦