Most bikes will do that, there is nothing wrong with the bike. What you have to do is click it down while either moving or let the clutch out just a little bit, not enough to move the bike or stall it, then pull it back in and then click down on the shifter. Or you can rock it back and forth a little bit while stopped but you'll look awful goofy doing that. The gears and syncros don't seem to mesh when they aren't turning a little bit.