iPhone 5 distorted 3D models

We are having a weird bug appear only on iPhone 5 (we haven’t tested the iPhone 4s). Some of our 3D models are very distorted. Here are a couple of screenshots from iPhone 5, and iPhone 5s.

5 - 5s

5 - 5s

5 - 5s

The animations are working (but of course they don’t look good). We are using the Unity 5.2.3f1 and the iPhone 5 has iOS 9.2.1 on it.

What was causing this bug was the texture size. Turns out that Unity on iPhone 5 can’t handle textures sizes that are not a power of two.