Thank you Julie
I'm running Microsoft Project Professional 2010 - Service pack 2

I've tried several columns where I can put in value/cost and every time the numbers change. At first I thought is was because i had linked the tasks together (predecessors) So I started from scratch but all the same. It's odd that some numbers change while others do not. I also tried to add value to the number where the value was subtracted but then a new number would appear. There is no logic to these changing of value. Some numbers is added with 1, 2, 4 add 4 and other subtracted wit the same numbers.