Reclaiming skill points -- not getting full points back?

Hi I'm very new to the game and quite enjoying it.

I put some points into skills that I learned I don't really use and wanted to re-allocate those points. There's one skill that has 4 points in it, and the cost to reclaim a point is 25. However, I push that once and the 4 becomes a 0. What's going on here?

Other skills I was able to reclaim each point at a cost of 25. But that skill above just went from 4 to 0.

Another question: is it generally better to max skillS or spend to move up the progress bar?

Thanks!