After importing into Maya, I assume the animation adjusts to a 24 fps (the default fps in Max is 30), which is why the frame values become so uneven.
I've updated the information in the guide. I replaced our formula with FrozenSoul's, and of course, I mentioned that you came up with it. Thank you for your contribution.
Added 5 minutes later
P.S. Show me at least what model you're adding to the game. I'd like to see a screenshot or two. ))