follow laminate floor pic.

Hi all, Many thanks for answering my question about the laminate floor.  I got one picture here. you can see the bump in the middle of the wood.  This was taken 2 days after the installation. Now weeks after, there are many more, hundreds of them. but mostly are smaller and hard to get a good picture. Please, all the experts, you think it is due to unclean floor? moisture? or some thing else?  How long the floor like this can last?  The contractor is willing to redo it. but I need to buy new laminate wood and he has a fight with my tenant. Now if he go to do it again, I have to be there.  I have a full time job and kids.....55555.  Meow meow is crying... Dogs can cry, any one see a cat cry...