Please keep in mind that (your handheld) XRF cannot discern things like C, O, N, H which your material has. That said, do not ascribe anything to the XRF readings.
The only thing that matters on that is the input weight, the after incineration weight, and the assay.
I'd just as soon wished you hadn't added the Rh in with the Pd as that makes a straightforward job into a multimetal separation.
If at all possible, please let me know which salts were mixed in. Some of the P containing ones leave residues that cause problems down the road, particularly with the solvent extractant that I'll now have to use to separate the Rh from the Pd.