Need advise on dogie roof i think

i recently finished building my own home,but i think ive came across a major problem in the roof.the roof is attic trusses in a dormer bungalow,the problem is ,when i put my level on to some of the trusses they r not plumb.i have roof tiles on the roof ,an im worried incase its a major problem an i hav to get them removed an do it all over again.any sugestions :x