Open the load lid.

Confirm that the latch bolts are secured tightly.

If these are loose, remove the bolt apply Loctite thread locker, and re-install the bolt.

Assessing the Load-Lid lock strike position and function.

The latch should align over the U-Bolt latch strike as shown.

When the lid is closed, this silver tab should be seated on top of the lock strike.

As the latch is turned, this silver tab should drop down behind the lock strike holding the lid unlocked while the lid is lifted with one hand.

As the lid is closed, the silver tab should sit on top of the U-Bolt and there should be a distinctive click as the lock strike engages.

The U-Bolt can be adjusted up and down as shown in this video. 
Load-Lid Slam Latch Adjustment

If the latch seems to be misaligned front to back, or one side is sitting differently to the other, firstly check that the lid is sitting square on the tub by comparing this to a reference point on the tub on each side.

If the latch needs a minor adjustment forward or back, this can be done levering this with a large screw driver.

Test the latch and adjust as required.