my experience is they mostly require a good slam to latch fully, especially with new rubber, but there are some adjustments you might fiddle with, including the hinge bolts into the body
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics