Points changing during rate lock period?

[James McCarthy]

I'm in the process of doing a refi and have my rate locked. Every time I get a revised estimate statement during the underwriting process, the points have changed. They were initially 1.5%, a week later .5% and now .95%. I'm not really complaining since its still lower than I initially thought it would be, but I've never run into this before. Curious about why its happening.