Vertices merge when importing model

[turbid yacht]

https://sketchfab.com/3d-models/sucan-403b6e0e373a4303957b2973a6f04bc0

I have this model here that seems mostly fine, but I noticed that on the teeth that the vertices have been completely moved, not just displayed incorrectly. (I assumed they needed to be triangulated, and when that wasnt the case I came here haha) So ive been trying to re-upload the model but I cant seem to find the issue.

I thought it was a blender export issue, but exporting the .fbx file to maya shows that the teeth are correct. Im pretty new to blender so I might have missed something in the export settings. Ive looked for overlapping faces, deleted history, and still no dice.

I also checked if it would work if I uploaded a whole new file, but the error still persists.

Please let me know if you have any suggestions, the model and rig are native to blender.

close-up of the merged/moved verts on the teeth

(Blender) how they should look

the blender file .fbx imported into maya to check if the blender export was already borked, but looks correct

so as far as I can tell sketchfab just doesnt play very nice with .fbx files???

[tight sentinel]

Perhaps it's a matter of precision. The teeth are very small in relation to the overall dimensions of the model. Possibly Sketchfab does not have enough precision to display small details like that.

[thorn vigil]

There is some data compression on the processed version of a model, so I'm guessing they're getting rounded down and ending up at the same point. Support might be able to turn this off if you contact them.

It could be worth uploading a non-animated OBJ version of the model first, just to check if you get the same result

[turbid yacht]

ill give that a shot before contacting support!