By some chance, do you have a 25 pound limit on your max package size that you will ship
BINGO! But I changed it to 70 and now doesn't calculate anything. I tried 30 as well but continues giving same result. So how I'm supposed to make all the changes there to make it work (it was working perfectly with Marco's module).

Linda, I will if necessary now that I noticed this issue is because of the max package was the issue. The problem of showing the total weight continues being a problem even I have it unchecked on the configuration. I strongly believe this is a db issue (but I'm not programmer)