Meshes from models being deformatted over time?

Help and Feedback Art Design Support
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#1

I have upload plenty of models to my place and saved to roblox but overtime they lose polycount without me interfering with them. I’ve tried importing them to a new place and still have the same issue. I don’t know if this is a roblox issue but it’s the first time I’ve encounter with it

reference;

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#2

can we get a before and after picture to know exactly what has changed?

(Roblox does have a poly limit, but it would tell you if you went over so idk if this is the issue)