It leaked in transit
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The trigger itself
Boxes stacked on each other press triggers, and a sprayer without a lock empties into the carton. Shipping with the trigger locked, or with a transit cap fitted and the sprayer bagged separately, prevents it entirely.
On its side, which is always
A bottle lying down puts liquid against the closure for the whole journey. That is a sealing test the upright bench test never performed, and it is the normal condition for anything in a parcel.
Pressure and temperature
A bottle filled warm and shipped cold develops a slight vacuum; one filled cold and left in a hot vehicle pushes. Either can move liquid past a marginal seal, and the second can deform a thin-walled bottle.
Headspace helps and too much hurts
Some headspace accommodates expansion; a lot of it lets the contents move and slosh against the closure. Filling to a consistent level by weight is the control, and it is the same discipline every property here arrives at.
Pack for the weight and the liquid
A carton rated for the mass, dividers so bottles cannot knock, and enough fill that nothing moves. A single leaking bottle usually ruins its neighbors’ labels as well as itself.
Test it by shipping it
Send a case to yourself, laid on its side, and open it carefully. It costs one carton and it answers the question that bench testing cannot.
A leak is rarely only one bottle
It soaks the labels of everything around it, and a case that arrives stained reads as a quality problem whatever the cause. Pricing the transit cap and the divider against one ruined case, and the labels it took with it, usually settles the question.