Bayesian t-test - same data different BF10 each time
I was working with the Stereograms t-test data set with Mann-Whitney while reading the reporting guidelines preprint. While I was flipping between different hypotheses when I returned to Group1>Group 2 I get a completely different BF10 while all the other factors remain the same. Mann Whitney W stays at 973, credible intervals are always the same but BF10 has varied between 10.44 and 5.7. (See attached screenshots).
Any idea why?