XRF tests were performed on magnetite where the oxide content showed 49.822% Fe2O3, so why not Fe3O4 content as a percentage? How can we deduce the Fe3O4 content?
I think this should answer your question:
https://www.thermofisher.com/blog/metals/question-about-xrf-and-element-ions/
XRF does not measure the chemical form. The analysis just adds oxygen to the cations in a predefined way. If the contents sum up to about 100%, this is a sign that the analysis is valid.
In your case, the sum before normalisation was 112%, so this is a little bit to high. You can recalculate assuming Fe3O4 instead of Fe2O3. As Fe3O4 contains less O (relativ), the sum will then be nearer at 100% (a rough estimation of me yields that 49% Fe2O3 correlates to about 40% Fe3O4).
So this is plausible, but no proof.
If you know from other sources your material must be Fe3O4, you can be happy because than the analysis makes more sense (sum being nearer 100%) than in the case of assuming Fe2O3
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