I have 4 Gastornis in a pen. They started with 6 HP, if I remember correctly, and gained HP as they aged, as expected, reaching 16 at around age 9. Now that they've hit age 11, they've suddenly all gone back to 8 Max HP. They've gone to age 14 now with no further change to their HP, they seem to be stuck at 8. Does anyone know what may be causing such an issue?