Why does the cursor keep jumping to the end of my TextFieldView while typing?

Question

I have a sproutcore 1.0 page with SC.ListView items and a SC.TextFieldView bound to the same property of a model.

When I type at the end of the TextFieldView everything works as expected. If I position the cursor in the middle and start typing the cursor jumps to the end. What could be causing this?

I suspect that the jumping is happening when the updated value is propagated via the bindings. If I type quickly I can enter a few characters before the cursor jumps.