Batched renderer not setting uniforms on styled text correctly

When using two styled Text elements, one with Text.Raised and one with Text.Sunken styles both are rendered with the same appearance when using the batched renderer.

Using either style on it's own renders fine.

I think it could be because the only difference between the two styles is the uniform vec2 shift and perhaps this uniform is not being updated when the two text items are batched together.