As I observed, hubscore will be 49 if you just save the hub unpublished and then publish it. I suggest publishing it first and then editing again if modifications are needed. This happens even your hub contents are good.
I faced this in some of my hub, now those hubs are showing hubscore of 70+. So don’t worry about the initial hubscore.
You can help the HubPages community highlight top quality content by ranking this answer up or down.