The sprayer did not fit
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How it happens
The bottle is chosen for how it looks, the sprayer for the diameter, and the second number is read as a variant rather than as part of the specification. Both cases arrive and nothing threads.
What the numbers mean
The first number is the nominal diameter in millimeters and the second describes the thread configuration. 20-400 and 20-410 are the same diameter and different threads, so the bottle and closure will meet and not engage properly.
The measured position on this shelf
31 of the 63 containers are 20-400. Of the 34 fine mist sprayers in the catalog, 16 are 20-410, 14 are 24-410 and 4 are 20-400. So the common bottle has the uncommon sprayer finish.
Partial engagement is worse than none
A sprayer that will not go on at all is obvious. One that runs down crookedly and seems seated leaks in a bag and loses alcohol in storage, and that is discovered by a customer.
Which is why the verified list exists
Every container page lists the closures matched to its own neck, and 18 fine mist sprayers are matched to necks on this shelf. Starting from that list is the whole fix.
And why you standardize on a pair
Choose the bottle and the sprayer together, then build the range on that pair. It buys one fitment in volume and it means one compatibility test rather than several.
Order samples and assemble them
Before the case quantity, with the real formula in the bottle. Thread engagement, spray pattern, seal when laid on its side, and the look of the assembled unit are four things a photograph will not tell you.
The cost lands on both cases, not one
A bottle and a fitment that do not mate leaves you holding two case quantities, neither of which is usable without buying the matching half again. That is why a sample assembly before the order is the cheapest step in this whole property.