If nobody replies with a useful answer, consider...
1: Nobody can see code you're running.
2: The hardware you're using and how you've actually wired it is also invisible (other than using pins 18 & 19)
3: You posted this in the Arduino 101 section, even though you're using Arduino Mega.
Maybe try posting in the correct area, and show the code, precise info about which parts you're using, and a photo of how you actually made the connections.
Good English is not required, but good info is.