I'm not sure how far back, but the current version of the game (v0.9.097) shows Frostwyrm-morph for me. I suppose, since both scores are at 5/12, they are essentially of equal weighting, so it'll come down to how your game sorts the scores, maybe? Computational sorting may be based on your device and regional settings, though I am not 100% positive this is causing the inconsistent results.
Since this is yet another edge case, and the scores seem too low to be selectable in the Preferred Species menu (ideally you would want over 50%--I think this threshold was lowered from 80%, so I don't think I'll lower it again), I suggest that the OP obtain at least one more Frostwyrm body part so the Frostwyrm-morph/Frostwyrm race determination actually sticks.
Edit: To prevent confusion, I've made an edit for the next release. If this edge case ever happens (having the top two races with matching scores that are also below the 50% threshold), the character should now be considered an "alien-hybrid". Again, if you want to guarantee a specific race, one race has to be greater than the other in the least.