Manual Shipping Method Dependencies Problem

I have a manual shipping method that is set to offer free shipping for orders over $25, and $5.00 for orders under this value.

It works fine, other than the fact that upon checking out, the estimator adds $0.10 every time, giving either $0.10 or $5.10, rather than just $0 or $5.

I don’t know how to fix this :confused: