Weird mesh deformation/corruption?

so im helping my friends with a game, and there’s this star mesh i made, here is how it looked like YESTERDAY


(it’s also a reuploaded one)

and here’s whatever happened today

what makes stuff like that happen in a mesh, and what can i do to prevent it? because it seems it comes with time…

This looks like a common Roblox mesh issue often worsened by LOD or streaming so try re-exporting as FBX with triangulation, recalculate normals, merge vertices and set RenderFidelity to Precise, it usually fixes it.

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