Why is my mesh not properly uploading with the colours?

Hey everyone! It's CatNinja4893 from Dark_Kat Studios... again... I was wondering why my mesh that I uploaded to Roblox Studio (It had colors) but it looked like a cow. all of the colors were in the wrong spots! I have absolutely NO idea why this happened. I didn't get an error other than "troubles uploading mesh. Visit somethingsomething.com for troubleshooting"

Please help me!!! I can't upload any pictures, so I cant show you. Sorry!

-CatNinja4893