I have a 16 ft car hauler. It had qty 15 2x6 boards on it. i removed them all and bought 15 pressure treated 2x6 boards. put them all on and the last board won't fit. is this common? none of the original boards were cut down etc. so i'm a little confused why i cant get the last board to fit... i have not secured any of them yet, wondering if i just need to pry the boards over and force it to fit?